6 Best Digital Aquarium Thermometer 2022

Best Aquarium ThermometerHaving an aquarium and keeping the fish alive longer is not an easy task. You need to keep their environment clean, healthy, and at the right temperature. That is why you need a digital aquarium thermometer in the aquarium.

Your heater might have a built-in thermometer, but it wise to have another one, just in case the other one is not as accurate as of the other.

Finding the right thermometer can be a daunting task. We understand your sentiment. That is why we have reviewed 6 of the best digital aquarium thermometer in the market today. To help you choose, we include some of the unique features of a thermometer and the pros and cons of using the product.

We hope after reading this comprehensive review, you will be able to choose the right thermometer for your aquarium.

Digital Aquarium Thermometer Reviews

1. Capetsman Digital Aquarium Thermometer

This digital aquarium thermometer by Capetsman comes with a modern look and compact design. It has an easy-to-read, clear LCD screen that provides accurate temperature readings. This thermometer can help you a lot in keeping your pet fish happy, active, and healthy.

This thermometer is wireless, so you will not have any problem with messy wires. The backside temperature sensor can monitor the water condition accurately. You will not encounter any problem with water filtration and corrosion of electronic components. It is not just a thermometer. It also makes your aquarium look beautiful and unique.

Things We Liked

  • Easy to read
  • Wireless
  • Enhance the look of your aquarium
  • Monitors the temperature accurately

Things We Don’t Like

  • Low alarm volume

2. Inkbird ITC308S Temperature Controller for Aquarium

The Inkbird ITC308S Thermometer may look complicated and intimidating as compared to others, its because it does a lot of work. It offers unique features not found in other brands. Inkbird ITC308S can also control and checks the temp of your heater. This thermometer allows you to set the temperature range, and the thermostat will do the rest.

The set temperature and the present temp is on its display. The readings are available in Celsius and Fahrenheit. It is not a heater, but you can plug it into the heater and control it. You must calibrate it first so you will get accurate readings, and it will function smoothly.

Things We Liked

  • With its Wifi feature, you can monitor the temperature remotely
  • Setting the temperature level is easy using its onboard menu system
  • Easy to use
  • Plug and play design

Things We Don’t Like

  • Hard-wire temperature probe

3. Qguai Aquarium Thermometer

If you are looking for an aquarium thermometer that will not cost you that much, the Qguai Thermometer is a good option. It has a sleek and straightforward design with a large clear screen that displays the temperature readings.

You can get temperature readings in Celsius or Fahrenheit. The thermometer has a precision backside probe that sticks on the fish tank. CR2032 powers this Self-adhesive fish tank thermometer. Simply tear down the film and stick it outside of the aquarium.

This aquarium thermometer has a lovely fish tank decoration to make your tank stand out. You can watch the fishes swim peacefully on the tank.

Things We Liked

  • Suitable for different types of water like freshwater, marine water, tap water, and saltwater
  • It can function as a terrarium thermometer in case you have a reptile in the aquarium.
  • With a 6-month warranty.

Things We Don’t Like

  • It does not have a suction cup

4. Zacro Pack 2 LCD Digital Aquarium Thermometer

It comes in two packages and is easy to install and use. Zacro Pack has a wide temperature range, from -500C to +700C, and with an operating temperature range of -100C to +500C. This digital thermometer has a large LCD that is easy to read but with a compact design.

If you need an aquarium thermometer that is functional and easy to use and read, Zacro Pack is for you. It provides accurate readings.

The package includes the battery to provide power to the thermometer. Zacro comes with a 24-month manufacturer’s warranty.

Things We Liked

  • Wide temperature range
  • Powered by one LR44 battery included in the package
  • With 24-month manufacturer’s warranty
  • Easy to read LCD

Things We Don’t Like

  • The suction cups are not as reliable as expected.

5. VEE GEE Scientific 83110Digital Thermometer

If you are in search of a budget-friendly digital thermometer that is very accurate, Vee Gee Scientific 83110 Digital Thermometer is what you need. You can read the temperature at Centigrade and Fahrenheit that is displayed clearly on the screen.

If you have a tank for tropical fishes, this thermometer is an excellent choice. This kind of tank requires a warm temperature, so monitoring the temp is a must. The screen has a moderate size to view the display easily. The thermometer includes an LR44 battery that you can use for a very long time.

Things We Liked

  • Affordable
  • Can be read both at Centigrade and Fahrenheit
  • Provides accurate readings
  • Long battery life
  • Easy to turn on and off

Things We Don’t Like

  • It does not have an alarm feature

6. TOOGOO Digital LCD Fish Aquarium Marine Vivarium Thermometer

The Toogoo Digital Thermometer is very affordable with a 25 mm x 12 mm LCD screen having a 1-meter cable connected to its probe. It is very compact and smaller than your hand. The thermometer is lightweight that measures around 3.5 ounces, so it does not offer much weight if you install it with the use of the suction base.

DC 1.5V LR44 battery included in the package provides power to the thermometer. It is made of premium quality material, but it is not as waterproof as the others, so you need to cover it during operation. Toogoo Digital Thermometer should not work together with other electric connections.

Things We Liked

  • It has a compact design
  • Provides accurate readings
  • Affordable and durable
  • Portable and lightweight
  • With on/off button to save the battery power

Things We Don’t Like

  • Without a backlighting system

Buying Guide

Now you have some idea as to what to expect from a digital fish tank thermometer. Your next step is to make a decision. But before you do that, there are factors that you need to consider so you not get frustrated.

Types of Aquarium Thermometer

An aquarium thermometer is available in various types. Not all will provide the same result. Some are more accurate than the others, so choose the one that will suit the kind of fish you have.

Digital Thermometer

This type of fish tank thermometer has a digital display unit that is placed outside of the aquarium with only the probe submerged in the water. It is available in wireless and wired models.

The digital aquarium thermometer provides very accurate readings since the probe is in the water. Most of them come with an alarm system to alert you if the water exceeds or below the required temperature.

The temperature can be read in Fahrenheit or Centigrade. This type of thermometer is a bit expensive as compared to others.

Stick On Thermometers

The stick-on thermometers, or sometimes called the LCD thermometers, are more affordable. The best thing about this type is that it never breaks.  Stick on thermometer has a thin LCD strip that is installed outside the aquarium. It displays the readings clearly.

The only drawback of this type of thermometer is that since the stick hangs outside the tank, it may not provide the accurate temperature of the water as the outside temp may affect it. Place the stick away from the direct sunlight or in other heating devices.

The stick-on thermometers do not have any alarm feature, so you need to check it manually.

Standing or Floating Thermometers

This type of thermometer is an analog type of thermometer that you need to submerge it completely in the water to be able to get an accurate reading. The temperature reading from this kind of device is very reliable.

The only problem with this thermometer is that it is quite hard to read. It also does not have an alarm system. As compared to other types of thermometer, the standing or floating thermometer is quite fragile, so you need to be very careful as it might break inside the tank, which is dangerous for the fish.

Ease of Use

Choose an easy to use a thermometer instead of the one with complex or complicated settings. The more complicated the device, the more likely you will get a wrong reading.

Also, a complex thermometer is hard to install, and interpreting the result is not easy as well. So when choosing an aquarium thermometer to select the one that is easy to install and with an easy to understand operating system.


This is the primary concern in any product you deal with. The thermometer may provide you accurate results. However, if it is not durable enough and you need to buy it again and again, then it is not worth it.

It will pose dangers to your fish, mainly if it is a thermometer that you need to submerge in the tank. If it breaks inside the tank, your fish will be exposed to chemicals putting their health in danger.

Also, it is best to have a thermometer that lasts longer, it is money-saving and keep you from replacing the tool every now and then. The best thing you can do before buying is to check the reviews and ask the experts for suggestions.


Your primary purpose of installing a thermometer in your fish tank is to make sure that the water is in the best condition to keep them healthy and safe. So, accuracy is an essential factor that you need to consider.

Keep in mind that not all thermometer provides an accurate reading. The readings some devices provide are affected by the temperature outside the tank. So make sure you are aware of this. Accuracy is critical in this kind of tool. Some fish are quite sensitive, and a sudden change in temperature can affect them drastically.


The thermometer’s temperature range is an essential factor to consider. If the field is too small, it is not flexible enough. If you own fishes that live mostly on tropical weather, then choose a thermometer with a more extensive range.

If the fishes are more suitable in cold weather, then it is best to get a thermometer that ranges below 20-degree centigrade.


You maybe have the most accurate thermometer installed, but if you cannot read out from the screen, it is not worth it. Get a thermometer that displays the result clearly and easy to understand. Most of the thermometers submerged in the water are hard to read. Choose the one that features a clear display that is easy to read even from a distance.

The Benefits of Using an Aquarium Thermometer

Fish experts are quite concerned about installing a heater for a tropical aquarium to make sure the fishes have a comfortable environment. But, closely monitoring the temperature is as vital to prevent harm to your fishes. It’s a must that you track the temperature and check it once or twice a day.

To help the fish live longer and healthier, you should provide a favorable temperature. The temperature changes between night and day and when changing the water, which stresses the fish. Sometimes it could lead to the death of some fishes.

If the heater breaks accidentally, the water temperature tends to rise or fall fast. You should not take this situation lightly as it can create massive harm not just to the fishes but to the corals as well.

There are thousands of thermometers in the market today, and you should find the right type of device for your aquarium.

Final Thoughts

We hope you have decided which thermometer to buy after presenting to you six of the best digital aquarium thermometers and the factors you need to consider when choosing.

For us, we find Capetsman Digital Aquarium Thermometer is worth buying for. It is a stick-on thermometer that displays accurate results clearly. It is made of durable materials. you don’t have to worry about breakage.

Most of the reviews from the previous users we find are positive, so you can be sure that your aquatic pets will have a favorable environment to thrive on. If you have questions or concerns about the topic, feel free to comment below. You can also share some of your ideas in mind.