Rating of the best thermometers for aquariums for 2021

In order to maintain a healthy metabolism in aquarium fish, the owner must constantly monitor the water temperature. Most ornamental fish are cold-blooded, which means that the internal temperature of the body depends on environmental conditions. The fish’s body is accustomed to functioning relatively normally only within a certain temperature range, so deviation from the desired values ​​(excessive overheating or, conversely, cooling of the water) negatively affects the health of the inhabitants of the aquarium. Inappropriate temperature levels can also lead to growth failure, cardiac or respiratory paralysis, and the death of the fish is just around the corner. It is possible to control the temperature in an artificial reservoir using a special thermometer.

Why do you need a special device?

The main purpose of the device is to measure the temperature of the water in the aquarium. It is worth constantly monitoring the upper and lower limits. Without this most important factor, it is impossible to make keeping fish comfortable. It's like air temperature for a person. Each inhabitant has its own requirements and range. If you cross the border, death may occur.

The temperature range of the liquid in the tank is from 18 to 24 degrees. The exception is tropical species. They feel great in thirty-degree water. It is worth keeping in mind that the optimal value is 25 degrees.

Maintaining certain indicators is not that difficult. On sale you can find special devices for heating and cooling liquids. Heaters equipped with a thermostat are installed in containers with tropical inhabitants. They automatically regulate the desired temperature.

But you don’t need to rely only on the heater. The temperature of the water in the tank is influenced by the heating devices turned on, direct sunlight, and ambient temperature, especially in the hot summer months. Therefore, the best manufacturers have filled the market with all kinds of measuring instruments.

The need for constant temperature monitoring

There are several reasons why temperature needs to be controlled as closely as possible:

1. Too cold water will make fish, especially heat-loving ones, lethargic, slow down their metabolism, and lead to diseases;
2. Due to too warm water, fish also get sick, organs and their systems stop working normally;
3. It is important to avoid sudden temperature changes. Even short-term temperature fluctuations have an adverse effect on its inhabitants.

For both fish and plants, the listed factors can be fatal if they exceed a certain threshold. Some species of underwater animals and varieties of aquatic flora are not so picky, but they also have their limits.

Types of products

Standard measuring instruments are small in size and have a primitive appearance, which does not cause concern among the inhabitants of the underwater world. Designed to perform the main task - they enable a person to constantly monitor the temperature of the liquid throughout the day. If problems arise, promptly respond and resolve them.

All manufactured designs are divided into two main groups:

• internal;
• external.

Internal ones must be in contact with water. The most basic device is made of glass. It looks like a flask, inside of which there is a solution that determines the temperature. Usually colored alcohol is poured inside, which takes on a red tint. A suction cup acts as a fastener. It allows you to attach the product to the wall of the container. A review of reviews shows that the following devices are in high demand:

1. Glass, thin. Their body is made of glass. Execution is standard.
2. Miniature. Models with reduced sizes. Purchased for small aquariums. Allows you to control the temperature and not limit your view.
3. With weighting agent. If the suction cup is of poor quality, the measuring device may come off the wall and float on the surface, distorting the values. The presence of a weighting material allows the structure to be constantly in an upright position and perform the task assigned to it.

Along with straight ones, manufacturers also produce curved models. They differ in the complexity of their design. The price is a little more expensive. The main advantage is that they will not float to the surface, even if the suction cup is detached from the wall of the vessel.

Waterproof electronic products are considered a separate subspecies. In it, the sensor interacts with a microprocessor and display, which are located in a sealed housing. The average price of the product is high, but quite justified. The models are distinguished by the accuracy of their readings.

The main weak point of submersible structures is the suction cup. Over time, it loses its original characteristics, becomes less elastic and can bounce off the wall of the vessel at any moment. It needs to be changed every few months or even weeks.

External structures are characterized by increased safety, since they do not come into contact with the inhabitants of the aquatic environment. They also do not spoil the panorama. The following types can be found on sale:

Aquarium thermometer - detailed classification

Glass immersion samples

These thermometers are the most common and they are attached inside the aquarium to its wall using a suction cup. Their appearance is similar to that of conventional thermometers for measuring air temperature, only the measuring column contains an alcohol solution with paint, and not mercury. Such samples are considered to be quite accurate (more precisely, only electronic or mercury). They must be placed in a place convenient for visual observation, preferably in the corner opposite from the location of the heater, approximately in the middle water layer. Glass measuring products can have the following designs:

• Thin - the most popular and traditional option;
• Submersible products with a weighting agent - when the suction cup is detached, they will still remain in working order and will float on the surface of the water;
• Mini-models for nano-aquariums - with their help it is very difficult to “overload” the appearance of an artificial reservoir, they are practically invisible and do not block the panoramic view;
• Thin curved ones - they are attached to the edge of the vessel, which eliminates the possibility of the device floating up when the suction cup is detached.

IMPORTANT! The main disadvantage of all glass models is the suction cup made of rubber/silicone, which over time will lose its elasticity and adhere less well to glass walls. Also, large, inquisitive inhabitants of the aquarium will always try to tear off or break the glass thermometer by attacking it.

Digital self-adhesive samples

The size of such models can be completely different, but they always represent an elastic plastic substrate, on one side of which an adhesive composition is applied for fastening to the aquarium wall, and on the other side thermochemical paint is applied, depicting a temperature scale. Depending on the change in the heating indicators of the surface where the thermometer is attached, the colored scale will change its color. The biggest advantage of this model is its original appearance and long service life. This model is preferable to use in vessels with large cichlasomas (a popular breed of ornamental fish). The measurement accuracy of such products is not of particular quality, which is due to the fact that the device is glued to a glass surface, which is in contact not only with aquarium water, but also with the surrounding air. Therefore, it is necessary to place this device in a place where there are no direct ultraviolet rays and there are no heating devices nearby (radiators, radiators, heaters, etc.). Minor disadvantages include the fact that it will not be possible to re-glue this thermometer to another place - the color scale will certainly be damaged, therefore, the original location should be selected very carefully.

IMPORTANT! Self-adhesive models are installed only on the outside of the vessel.

Electronic samples

These products are the most accurate among their counterparts and have many additional useful functions (for example, light and sound alerts about critical changes in temperature values).

In total there are two types:

• With a remote liquid crystal display - they consist of a temperature sensor, which must be immersed directly in water, and a base housing. There is a screen on the case that displays temperature readings. The sensor is attached inside the vessel using a silicone suction cup and is connected to the base body via a wire. The body can be placed in any convenient place so that it does not block the aquarium panorama.
• Waterproof submersibles with a liquid crystal display - these products have a body that is waterproof and is equipped with an integrated temperature sensor. This device is installed inside an artificial reservoir, by analogy with alcohol models, using the same principles of fastening using a silicone suction cup. Their main advantage is that the design does not provide any wires. The only disadvantages include the very high cost, in comparison with all other types of thermometers. It is also worth mentioning that the batteries in the device (AAA batteries) will need to be replaced periodically.

Types of structures

Regardless of the manufacturer, manufactured products are divided into three main categories:

• liquid crystal;
• electronic;
• alcohol

Everyone's selection criteria are different. Much depends on the volume of the tank and its inhabitants. All models have both advantages and disadvantages. To avoid mistakes in the acquisition process, let's look at the characteristics of each group in more detail.

Liquid crystal

The most common and frequently found product. Purchased for a new aquarium. It is distinguished by high accuracy, ease of use, and affordable price. Many models have two scales: one shows the value in Fahrenheit, the second – in Celsius. Digital range varies depending on product. In any case, the required range is always present on the scale. There are products with vertical, round and horizontal scales.

Designed for mounting on the outside of the container. Disputes arise over the accuracy of the testimony, however, they are groundless. Even if there is a temperature difference between the environment and the liquid in the aquarium, it does not have a big impact on the accuracy. There are exceptions if the ambient temperature is much lower than the liquid in the tank. Then the value may differ by several degrees.

Experts advise adhering to certain rules for using products. Measuring instruments of this type should not be placed in direct sunlight or in close proximity to heating devices, ventilation systems or structures. They have a negative impact on the performance of the measuring device. It is not advisable to stick the device on a wall below ground level. The substrate does not allow fluid to move freely and readings may be inaccurate.

Positive points:

• Possibility of placement on any surface area;
• simplicity and efficiency of installation;
• not afraid of physical influences;
• The price/quality ratio is unique.

Negative points:

• inferior in accuracy to digital analogues;
• lack of a notification function about the occurrence of an emergency situation;
• In poor lighting it is difficult to see the readings.

Digital electronic

The main structural element of the products is the probe. It goes directly into the water. “On land” there is a digital display. These elements are connected to each other via a cord. On store shelves you can find improved models with wireless connectivity.

For the device to work, it needs a power source. Designs are available that connect to an outlet. Manufacturers equip their products with sound alerts. Unique and useful feature. It makes it possible to understand that the water temperature has gone beyond the lower or upper limit, and it is necessary to quickly respond to the problem.

Before purchasing the measuring device you like, you need to check the length of the cord. It may vary depending on the model. The practicality and ease of viewing data on the scale should not be overlooked. This characteristic is always relevant.

The advantages are:

• there is an alert function that allows you to save the lives of aquatic inhabitants;
• readings are easy and simple;
• the case is reliable and durable;
• the relevance of the readings is not affected by room temperature;
• accuracy is top notch.

The disadvantages are the following:

• dependence on the power source;
• will not function during power outages;
• the average price is high.

Alcohol

There are two subspecies:

• with fastening;
• floating.

The progenitor of all currently produced measuring instruments. It is in high demand due to the accuracy of readings and minimal error. Placed inside the container. The main disadvantage is that glass is used in the manufacture of the case. If the inhabitants of the underwater world are small, then you can not pay much attention to this drawback. It's another matter when large fish swim. It is worth keeping in mind that the designations on the scale are written in small print, which is difficult to read. Can be placed anywhere in the container. There is no adhesive surface for fixation, so they can be moved from place to place.

Positive characteristics:

• placement in any place at your discretion;
• does not depend on room temperature;
• reasonable cost;
• the presence of an easily visible “safe” zone.

Negative properties:

• has increased fragility;
• accuracy is inferior to digital analogues;
• It is difficult to take readings due to the small font;
• lack of notification function.

How to choose the right product

Everyone’s selection criteria are different, however, experts recommend first deciding whether you need an internal or external measuring device. Once the decision is made in favor of one or the other model, other nuances are taken into account:

1. Frame. The material of manufacture is of great importance. If we are talking about glass, then it is worth considering that the products are quite fragile. You need to carefully approach this characteristic. This determines whether the device can be used in sea salt water or only in fresh water.
2. Type. All manufactured products differ in measurement technology, which has a direct impact on the level of safety, durability, reliability and accuracy of the device.
3. The presence of a weighting agent. Its presence will allow, even if the suction cup has lost its original purpose, the measuring device to remain in a vertical position in the water and show true values.
4. Accuracy. Depends on the liquid that is used as an indicator to detect temperature changes. Options may vary. For some, an error of one degree is not important, for others the problem will be a change in the indicator by a fraction of a degree.
5. Dimensions of the structure. Selected based on the parameters of the aquarium. The smaller it is, the lighter and more compact the measuring device should be. The main properties are as follows: ease of installation, ease of use, complete safety and long service life.

General tips for placing thermometers

In order to obtain the most accurate indicators, when placing thermometers in an artificial reservoir, certain conditions must be observed. For example, it is strictly prohibited to place any type of thermometer in close proximity to a lamp or heater. Submersible liquid models must be attached only to the inside of the aquarium wall so that they reach the middle water layer. Most types of aquarium heaters have a built-in device for measuring temperature fluctuations. However, these data may have large errors. Accordingly, the presence of an autonomous device will become a justified necessity to achieve the goals of complete temperature control. Professional aquarists suggest using at least two models of thermometers in order to have a better idea of ​​the current temperature readings. These indicators, first of all, directly depend on the power of the heater and the volume of the vessel, so the readings of one device may not be enough. This can be arranged as follows: place a glass liquid thermometer on the lower level, and fasten the stick-on device, on the contrary, closer to the water surface. Through this simple scheme, it is possible to more carefully control temperature changes, and maintaining proper indicators will preserve the health of the inhabitants of the aquarium and even contribute to the treatment of sick fish.

Rating of the best thermometers for an aquarium under 1000 rubles

Orbit 14350715

This popular model is a design that is equipped with a remote-type sensor. A characteristic feature is the presence of a liquid crystal display. Due to the remote sensor, the device body can be placed on any surface. Temperature range declared by the manufacturer: -50°С - +70°С. The accuracy coefficient is +-1°С. The scale has a resolution of 0.1°C. Based on the description provided by the brand, the length of the original wire is 1 m. The sensor is classified as waterproof, so it can be placed in the tank itself. A 1.5 V battery (LR44) is included in the package. Suction cups that attach to the body are also included in the set.

The average price of a new product is 719 rubles.

thermometer Orbit

Advantages:

• presence of an external sensor;
• wide temperature range;
• build quality;
• waterproof housing;
• compact dimensions;
• self-adhesive suction cups included in the set.

Flaws:

• not identified.

Thermal 39885448

Before choosing this model, it should be noted that the device belongs to the category of digital thermometers. Declared temperature range: -50°С – +110°С. An excellent solution not only for arranging an aquarium, but also a water tank, a freezer, an outdoor space, a sauna, and a refrigerator. The sensor element is connected via a wire and can be immersed in the water column. Dimensions: 58x36 mm. A great way to measure the temperature inside the steam room. Can be used in industrial freezers and rooms.

The delivery set includes a high-quality suction cup that will allow you to place the sensor on any surface. The case itself is mounted on the wall using a removable suction cup. Based on numerous reviews, you can use double-sided tape to secure it. Wire length – 1 m. Dimensions of the liquid crystal display: 23x12 mm. The measurement scale is Fahrenheit and Celsius. Metal and plastic are used for manufacturing.

You can purchase the design at a price of 599 rubles.

thermometer Thermal

Advantages:

• touch sensor;
• wide scope of application;
• minimum error;
• runs on batteries;
• vacuum suction cup included;
• manufacturer's warranty.

Flaws:

• not identified.

JBL GmbH & Co. 33132199

This device is a glass tube, the length of which is 150 mm. The product from a time-tested German manufacturer is in deserved demand among domestic and European consumers. Declared temperature range: 0°C - +50°C. For subsequent installation, use the suction cup included in the package. The material it is made of is resistant not only to alkalis, but also to acids.

Average price – 587 rub.

thermometer JBL GmbH & Co.

Advantages:

• German build quality;
• equipment;
• classic form factor;
• unlimited service life;
• minimum error.

Flaws:

• not identified.

KEV line 30278932

This device is ideal for large structures. It is based on the use of a waterproof housing. The minimum error deserves special attention, due to which the product will be useful to those users who keep ornamental fish. For installation, it is recommended to use branded suction cups, which are included in the package. They are easy to attach to the inner surface of the structure. The digital thermometer is easy to use and incredibly convenient. There are no external wires. The numbers are quite large and clearly visible in the water column. The color is delicate, blue. It looks really beautiful and stylish. Stated dimensions: 45x30 mm. For subsequent operation, the device will require a battery, which is included in the package. Water temperature measurements occur in the following range: 0°C - +50°C.

Cost – 527 rub.

thermometer KEV line

Advantages:

• no wires;
• large dial;
• stylish body colors;
• submersible type model;
• suction cups are used as fasteners;
• can be ordered online;
• battery operated.

Flaws:

• not identified.

HT-5

This model belongs to the electronic category and is equipped with a remote sensor. Declared temperature range: -20°C - +70°. In addition to aquariums, the design can be used in any room due to the presence of a remote sensor. Stated error: 0.1-0.2°C. This device does not show the humidity coefficient. The device is equipped with off/on keys, as well as a switch (Fahrenheit/Celsius). For installation on a smooth surface, it is recommended to use a proprietary suction cup. The model is equipped with a liquid crystal display with a diameter of 35x16 mm.

How much does the device cost? The purchase will cost 518 rubles.

thermometer HT-5

Advantages:

• compact dimensions;
• wide range of applications;
• ease of subsequent use;
• wire length 1 m;
• battery powered;
• suction cup included;
• wide temperature range;
• minimum error.

Flaws:

• not identified.

TOP-best thermometers for aquariums up to 500 rubles

TECHMETER 33270327

This electronic device is made of plastic. Dimensions declared by the manufacturer: 110x40x27 mm. The device is universally applicable and can be used not only in water tanks, but also in cars, construction sites, residential premises and any other purpose. The remote-type sensor is located at the end of a meter-long wire, which allows you to secure the housing in any place convenient for the user.

Average price – 499 rubles.

thermometer TECHMETER

Advantages:

• build quality;
• wide scope of application;
• minimum error;
• presence of a liquid crystal screen;
• large numbers that are clearly visible in the water column.

Flaws:

• not identified.

Dennerle 28400850

This compact and easy-to-use device is characterized by its small size and ease of use. Glass and plastic inserts are used to make the case. For subsequent installation, it is recommended to use a proprietary suction cup or double-sided tape. There is a high measurement accuracy, which is calculated in Celsius. The scale is clearly visible in the water column.

Cost – 464 rubles.

Dennerle thermometer

Advantages:

• German build quality;
• compact dimensions;
• minimum error;
• high-quality suction cup;
• affordable price;
• unlimited service life.

Flaws:

• not identified.

Waki 43240605

This electronic type device is equipped with a digital display. An excellent solution for checking the temperature in residential and industrial premises, aquariums, refrigerators, freezers and other places. The design is simple, classic. Not demanding in care. Cord length – 1 m. Operating temperature range: -50°С – +110°С. The measurement time is 20 seconds.

How much does the device cost? The purchase will cost 430 rubles.

Waki thermometer

Advantages:

• runs on batteries;
• compact dimensions;
• ease of use;
• unlimited service life;
• affordable price.

Flaws:

• not identified.

LAGUNA 46577515

High-strength plastic and glass are used to manufacture this device. The easy-to-use design can be installed either using a proprietary suction cup or double-sided tape. On the shelves you can find 10 color variations of this model, which will make the device invisible among the decorations of the aquarium. The measuring scale is given in Celsius.

Average price – 399 rubles.

thermometer LAGUNA

Advantages:

• unlimited service life;
• convenient form factor;
• wide range of colors;
• durable body;
• build quality.

Flaws:

• not identified.

Aleas 15455914

It is these devices that are often placed in aquariums by experienced users. Glass and plastic are used to make the structure. The size of the product is small, making it difficult for fish to knock it down. The measurement scale is located in both Celsius and Fahrenheit. For installation, you can use either double-sided tape or Velcro (suction cup).

Cost – 333 rubles.

Aleas thermometer

Advantages:

• unlimited service life;
• large numbers that are clearly visible in the water column;
• small size;
• convenient form factor;
• ease of installation.

Flaws:

• not identified.

Aquarium thermometer - general information

The modern market of technical devices for keeping ornamental fish can offer several types of thermometers. They differ from each other in functionality and design.

Internal models

These samples are placed directly into water and provide information about temperature changes. The simplest model is a liquid one, which operates by raising/lowering the mercury column when heating/cooling parameters change. Such thermometers are attached to the inner wall of the aquarium using a special suction cup. Their main advantage is their low cost, but their disadvantage is some error in measurements. Internal models also include electronic thermometers that have an external sensor. They are characterized by the high accuracy of the information provided, however, their price is somewhat more expensive than for alcohol products. The temperature sensor in electronic models operates on the basis of a thermistor placed in a separate hermetically sealed capsule. Thanks to the ability of the thermistor to quickly change its resistance with temperature changes, the electronic processor is able to permanently monitor and process information coming from the sensor, displaying it in the form of numbers on the screen.

External models

These thermometers do not need to be immersed in water in order to obtain data on the latter. They also do not need to be cleaned often, they do not take up much space inside the aquarium, and have an extended service life. The sticker aquarium thermometer functions thanks to the properties of a special paint that changes color when heated. The device is attached to the outer wall of the aquarium; accordingly, it can also respond to changes in air temperature near an artificial reservoir. Another name for such models is thermochromic thermometers.

Models with remote sensor

Another representatives of devices with extended functionality and service life. Their advantage is that it is possible to monitor changes in temperature indicators remotely, since the display is connected to the sensor itself via a wire of almost any length. The sensor (having a high level of sensitivity) is placed directly into the vessel, and the information display device is placed in any place convenient for the owner. In addition, with the help of these products it is also possible to control changes in the temperature of the soil in the vessel. It is no secret that the temperature of each soil layer differs by about 1 degree Celsius. If the soil at the bottom of the aquarium is not warmed up enough, then such a situation can harm the root system of algae in the aquarium and have a bad effect on the health of bottom inhabitants.

Practice shows that today there are many devices with which you can control the temperature in a vessel with water. If the aquarium contains unpretentious breeds of ornamental fish, then the temperature can be measured with a regular alcohol thermometer. If the inhabitants of the aquarium are sensitive to rare species, and the conditions of their keeping must be maintained as accurately as possible, then the owner is unlikely to do without an electronic thermometer. Especially if he wants to get offspring from his pets.

Rating of high-quality thermometers for an aquarium up to 300 rubles

PETSROOM 22656018

This digital thermometer has a large LCD display. Used to measure the temperature of water in an aquarium. For further operation, the device will require a battery, which is purchased separately. An excellent solution for a home aquarium of any size. Plastic and metal are used to make the case. Attaches to a self-adhesive surface. The dimensions of the device are small, thereby eliminating the risk of damage to the accessory by overly nimble fish.

Average price – 293 rubles.

thermometer PETSROOM

Advantages:

• Excellent value for money and quality;
• unlimited service life;
• compact dimensions;
• the presence of a self-adhesive base;
• minimum error.

Flaws:

• not identified.

Aquastyle 17772872

This device is designed to measure the temperature of the water in the aquarium. Glass and plastic are used for production. Attached to the suction cup included in the delivery set. The dimensions are small, which allows the device to be used in small containers. The measuring scale is clearly visible against the bright yellow background.

Cost – 250 rub.

Aquastyle thermometer

Advantages:

• ease of care;
• accuracy of measurements;
• unlimited service life;
• durable suction cup;
• build quality.

Flaws:

• not identified.

Akvafishka 33340351

This device will be an excellent solution for a small aquarium. It is characterized by the presence of a small error coefficient, which will allow you to monitor the current temperature regime in the container with fish. In addition to the device, the package includes a branded suction cup, which can be replaced with double-sided self-adhesive tape. Glass is used for production. Supplied in durable cardboard packaging, which eliminates the risk of damage to the goods during transportation.

How much does the product cost? The purchase will cost 250 rubles.

thermometer Aquafishka

Advantages:

• unlimited service life;
• compact dimensions;
• affordable price;
• minimum error;
• suction cup included.

Flaws:

• not identified.

Good Idea 32983380

This set includes two self-adhesive thermometers, which are categorized as liquid crystal thermometers. An excellent solution for a larger aquarium, bedroom or other living space. Based on numerous reviews, the designs have found application in children's rooms. They are classified as safe, as they do not have sharp corners or protruding elements. The scale has divisions from 18°-34°C. Measurements in Celsius. Can be attached to glass or any other surface. Comfortable in using. It is recommended to glue the product in a vertical position. The temperature is indicated in a special green, brown or blue window. ABS plastic is used for production.

Cost – 230 rubles.

thermometer Good Idea 32983380

Advantages:

• Includes two thermometers;
• convenient scale (large numbers and bright background);
• Excellent value for money and quality;
• compact dimensions;
• wide range of use;
• build quality;
• minimum error.

Flaws:

• not identified.