If you’ve gone through a few of the articles on this site, you’ve undoubtedly read multiple times how important it is to keep your fish at an optimal temperature, and it should be ideal for the species you have.

Whether you have freshwater fish or marine fish, you will need the best aquarium heater. But the question of the hour is how to determine if your aquarium is at a suitable temperature? It would be best to use the finest and most reliable aquarium thermometer to achieve a precise estimation.

And now, if you think about how to find the best thermometer, don’t worry. Because we have got you covered, our team has tried and examined hundreds of aquarium thermometers in the market and has found the capetsma Touch Screen Fish Tank Thermometer to be the best.

Keeping in mind that each customer is particular and has a unique taste, we have included nine more amazing fishtank thermometers to satisfy everyone. Their fishies can lead healthy and comfortable life.

Best Aquarium Thermometers Reviewed

All the products mentioned here are available online on amazon.com

capetsma Touch Screen Fish Tank Thermometer

capetsma Touch Screen Fish Tank Thermometer

Product details:

  1. Battery powered
  2. 3.2″ large transparent screen
  3. 32°F – 158°F +/- 1°F

Because of its functionality and ease of use, the capetsma Digital Touch Screen Fish Tank Thermometer is the best aquarium thermometer. This thermometer has a large LCD that extends from corner to corner, making it simple to read even from a distance of several feet.

Because the display is transparent, the thermometer will not obstruct your view of your fish tank. The thermometer is compact, completely wireless, and can be attached to the outside of the tank, where you can read you can read the meter via the glass.

It can display in both Fahrenheit and Celsius and has an accuracy of about one degree. It has an integrated alert system setting that causes the display to flash if the temperature falls outside of your specified range.

This thermometer is incompatible with plastic or acrylic tanks. It is applied to the outside of the tank using the provided double-sided tape. It adheres pretty tightly. They do not offer extra tape, which could be a problem in the future. It may also be difficult to remove once connected to the glass, so be sure before sticking it.

What we like:

  • Wide temperature range
  • Wireless design

What we dislike:

  • incompatible with plastic or acrylic tanks

Gain Express Digital Aquarium Thermometer

Gain Express Digital Aquarium Thermometer

Product details:

  1. Large screen monitor
  2. 3 Points PH calibration
  3. 4 x AA Alkaline Battery

The Gain Express Digital thermometer is a high-end thermometer that also functions as an efficient pH meter. This thermometer can be wall-mounted, hung on the tank’s side, or put on a tripod. This feature makes the device quite versatile and easy to set up.

The big display spans roughly from corner to corner, and the entire panel is large enough to indicate the temperature. The LCD features a backlight that allows you to read it even in the dark, but it enters power-saving mode after a period of inactivity.

Its inbuilt pH meter is also quite efficient. It can accurately measure the pH and be calibrated to a specified range providing enhanced control over the aquarium conditions.

While this thermometer can be used in many ways and offers longevity, the manufacturer advises that it will extend the probe’s life if it is not kept underwater at all times.

What we like:

  • Clear LCD display
  • pH probe is accurate

What we dislike:

  • Quite expensive

Inkbird Wireless Thermometer

Inkbird Wireless Thermometer

Product details:

  1. Battery powered
  2. 0.5°F resolution
  3. Smart LCD

The Inkbird Wireless Thermometer is an excellent thermometer with a broad range of measurements and intelligent features. This thermometer can monitor temperatures ranging from -40°F to 140°F and can also measure humidity.

This feature is quite helpful if you’re using it for items that need high humidity but aren’t in the water. This sensor is compact and has rounded corners for a more modern touch. The sensor is waterproof and long-lasting, and the monitor can be attached outside the tank.

The device is compact and light. The majority of the weight is most likely in the wire and probe. The cable is considerably longer, but this is not a problem. The software is adequate and enables the export of CSV files, allowing you to do whatever you want with the data.

It might expand this functionality to allow automatic uploading to the cloud or simple communication with home automation software. It’s fantastic to have a functional monitor of precisely the two things I need to check for my aquarium.

What we like:

  1. Measures humidity and temperature accurately
  2. Smart features

What we dislike:

  1. It is expensive

Inkbird C929A Wi-Fi Aquarium Temperature Controller

Inkbird C929A Wi-Fi Aquarium Temperature Controller

Product details:

  1. 1200W
  2. -40℉~212℉
  3. LCD Display

The product works phenomenally. This temperature controller’s WiFi capability is fantastic. The software is also helpful for graphing temperature peaks and falls while keeping my temperature within.5 degrees. The dual temperature probe provides excellent redundancy.

This version, I believe, comes with two relays to back up the other relay in the event of a failure, which is a great feature. I wish the LCD were brighter so I could see it from a distance. This is for my discus fish; however, you can also use it in your reef aquarium.

It maintains a consistent temperature in the aquarium and has an exceptionally accurate thermostat. The WiFi capacity is excellent, and I’m enjoying the InkbirdSmart app, which now includes all of my Aquarium Heater systems.

The only drawback is that the instructions with this device are pretty complicated, and it may be difficult to set everything up. But after setting it up, it is easy to use.

What we like:

  1. Dual probes
  2. Smart app makes it versatile

What we dislike:

  1. Instruction is a bit complicated

JW Pet Company Smarttemp Thermometer

JW Pet Company Smarttemp Thermometer

Product details:

  1. 30˚-104˚F
  2. Magnetic fastener
  3. 7″ length

This is a compact thermometer. s It measures around 7 inches long and an inch wide. The white background hue makes the contrasting black numbers/temperature simple to read. The magnet is a fantastic feature that allows you to move it around effortlessly.

This thermometer works by being placed into the tank and held in place by a unique magnetic fastening. This eliminates the need for suction cups or fishing a thermometer out of the bottom of your tank.

When cleaning the aquarium glass, move the device to the other side, and you are good to go. It also keeps the two components in contact well enough that they don’t separate when moved.

My tank is a 60-gallon cube marine tank. It boasts large, easy-to-read numerals and a green range marked for the appropriate temperature range for tropical tanks. I double-checked the temperature with a different thermometer, and it was the same.

What we like:

  1. Affordable price
  2. Strong magnetic fastener

What we dislike:

  1. Not very durable

Shyfish LCD Digital Aquarium Thermometer

Shyfish LCD Digital Aquarium Thermometer

Product details:

  1. 0.3 degree resolution
  2. LCD screen
  3. 1 CR2 battery

This product is a stylish thermometer with a white body and a display to see your tank. This thermometer can simultaneously measure the temperature and humidity levels. It’s precise and compact.

The LCD that is designed for showing the temperature is bright and clear. It correctly displays the temperature measured by the thermometer. You can set it to either Celsius or Fahrenheit, depending on your convenience.

You may specify maximum and minimum temperature ranges, and the thermometer will alert you if the heat rises from the defined range. The high-precision temperature probe may be submerged in water for an extended period to monitor the fish tank’s temperature accurately.

Because this meter does not come with instructions, it may be tough to figure out how to use it, and changing the batteries can also be problematic. Once the batteries are installed, the thermometer operates continuously and does not have an on/off button.

What we like:

  1. Dislay is perfect and clear
  2. Inbuilt alarm system to alert you

What we dislike:

  1. Instructions are difficult to follow

JLENOVEG 2 in 1 Aquarium Thermometer

JLENOVEG 2 in 1 Aquarium Thermometer

Product details:

  1. 1 LR44 battery
  2. -58 to 157˚F
  3. LCD display

I’ve owned aquariums for 20 years and have about every thermometer imaginable. This one is ideal for the job. This thermometer was quite simple to put up. I inserted a tiny battery, and it worked like a charm.

I love how quickly the thermometer stuck to the outside of my aquarium, and the sticky part is perfect adhesive, so it has fallen. The thermometer measures both the indoor temperature and the temperature inside the tank.

This is fantastic since I can now see how my room temperature affects the temperature of my tank. I also checked the thermometer’s accuracy. I used a digital probe thermometer inside the tank to compare it to the 2 in 1 thermometer, and there was only a 2-degree discrepancy, which isn’t too poor.

I also like how big and bold the numbers are because I was straining my eyes, reading the temperature inside my tank with the small thermometer. The thermometer can be set to either Fahrenheit or Celsius, depending on your preference. I suggest it!

What we like:

  1. Large and bold display
  2. Wireless design

What we dislike:

  1. No security system

Fluval EDGE Digital Aquarium Thermometer

Fluval EDGE Digital Aquarium Thermometer

Product details:

  1. Easy-to-read thermometer
  2. 64 to 86 degrees fahrenheit
  3. Vertical mount

It performs as expected and provides an excellent indication of the tank’s water temperature. Green shows that the temperature has been reached, while Tan and Blue indicate that the temperature is between those ranges.

When compared to a handheld digital thermometer, it appears to be accurate enough. Still, because of the significant difference between the listed temperatures, this is more for showing an estimate so you can tell if your tank water is at a perfect GENERAL temperature for the fish or water critter you’re keeping in the tank.

I like how compact it is and how it doesn’t take up much room or block much of the tank’s viewing surface. Put it anywhere below the water’s surface like I have put mine along the bottom corner of the tank.

This device displays a temperature range that looks to be correct. This thermometer is hidden; I ignore it when I’m looking at my tank. It just attaches to the outside of the tank, so installation is simple.

What we like:

  1. Easy to setup
  2. Wireless design

What we dislike:

  1. Difficult to read the display

AQUANEAT Aquarium Thermometer

AQUANEAT Aquarium Thermometer

Product details:

  1. LCD display
  2. 2 PCS LR44 button cell
  3. -58°F to 158°F

Excellent for the price! The suction cups may need to be upgraded at some point, but I was pleasantly amazed by the quality of the thermometer at such a low price. The temperature is precise and quick reading.

Because it is digital, the numbers are constantly visible, allowing you to monitor your water temperatures quickly. It is simple to set up and comes with an additional battery. If you don’t want it to be on all the time, you can turn it off. It works nicely in a variety of tank sizes.

I use these digital, remote thermometers with probes to check the temperature of my aquarium when filling it with tap water. They help me keep a regular visual of the temperature of my aquarium water for breeding tropical fish, and they are accurate to within half a degree.

It’s a win-win situation! Purchase with confidence. They also come with a battery installed as well as a spare.

What we like:

  1. Great price
  2. Accuarte measurement

What we dislike:

  1. Suctions cups are not up to the mark

VIVOSUN LCD Digital Aquarium Thermometer

VIVOSUN LCD Digital Aquarium Thermometer

Product details:

  1. -50℃ ~ 70℃
  2. LCD display
  3. +/- 1℃ resolution

There are almost a million listings for digital aquarium thermometers on the market. I’ve discovered that they operate well sometimes and poorly other times. According to what I can discern, each brand sells essentially the same thermometer under different branding.

When I bought them, this set seemed to be the best bargain, and thus far, they’ve provided correct readings. The chord is long! I keep most of it tied up, but this should suffice if you need a long cord.

The probe is placed at the bottom of the tank to obtain an accurate readout of the most excellent water. They come with two suction cups: one for the probe inside the water and one for attaching the thermometer to the tank’s outside.

If you need exact measures, you’ll want higher quality, but they are more than adequate for everyday aquarium use. In terms of battery life, expect to replace the batteries every 6 to 12 months, which is very common for LR44 batteries in my experience.

What we like:

  1. Accurate measurement
  2. Quite cheap

What we dislike:

  1. Not very high-quality

Types of Aquarium Thermometers

You’re surely aware that each sort of aquarium equipment has various variations, and aquarium thermometers are no exception. Even something as simple as a thermometer can come in a variety of styles.


This thermometer is often thought to be the most expensive of all, especially if you choose the best digital aquarium thermometer. However, some reliable digital thermometers are incredibly inexpensive, despite their high accuracy. They are unaffected by the temperature of the surrounding environment.

A probe is frequently used in conjunction with an easy-to-read digital display. In rare circumstances, the temperature is displayed in both degrees Celsius and degrees Fahrenheit. Many of these devices are battery-powered, but some can be connected to a power outlet. In most cases, a wire links them, although some have a wireless connection.

In other circumstances, the probe is left in the tank to check the temperature constantly. It may even contain an alarm that alerts you when the temperature falls outside of your selected range. It’s also exceedingly strong and nearly unbreakable. If you’re seeking the best aquarium thermometer, look no further than this category.

Floating or standing

For this type of thermometer, you must immerse it completely. Because it is not digital, you may have difficulty understanding the small print scale.

Some manufacturers have created a different hue for the safe zone to address this issue, so you’ll know right away if the temperature slips outside of your intended range. If you have a large tank, you may want to consider placing several of these thermometers at either end.

One primary source of concern is that the majority of these thermometers are made of glass. However, some are plastic, while others are stainless steel. As a result, they are far more delicate than other forms of thermometers.

Suction cups are commonly used to keep items in place. Some are magnetic, which means you can use a magnet outside to keep it in place. Others float freely in the water, though standing versions with weights at the bottom are available.

These items are reasonably priced. However, you will not discover features such as alarms or even LCD displays. It is also less exact than the digital model.

Stick On Thermometer

Because they contain an LCD display, these are often referred to as LCD thermometers. Some brands have even labeled these devices as digital thermometers, but they are in no way equivalent to the actual digital thermometers discussed previously in this article.

Make sure you don’t acquire a cheap LCD thermometer when you want a digital one. Because these things are on the exterior of the tank, their readings are substantially less trustworthy.

The ambient temperature in the room can affect their results. It’s worse if they’re positioned in bright sunlight or near heaters, vents, or other devices that can impact the temperature.

You may not want to put it below the gravel layer since it won’t be as precise. The LCD is also best viewed directly on the sides, so put it somewhere you can readily see it.

Why should you buy an aquarium thermometer

The aquarium thermometer’s primary advantage is that it allows you to monitor the temperature of your aquarium water. You can monitor the temperature at different times and on different days so that you may make the necessary changes to your setup to address any temperature-related issues.

Some of the best heaters already include a thermometer to ensure that the water temperature is at the right level. Even if that’s the case, you should still purchase one to confirm the reading on your heating thermometer. It’s always a good idea to double-check.

In many ways, using a thermometer for your tank is essential so that you are aware of any temperature swings your fish may suffer.

  1. Using a thermometer, you can ensure that your fish is living in an aquarium and the water is at an optimal temperature.
  2. You can validate that your heater is in good condition.
  3. You may also be notified if the temperature changes or fluctuates unexpectedly, allowing you to adjust your setup to deal with the circumstance. For instance, you could require a stronger heater or a different placement for your aquarium.

How to setup an aquarium thermometer

Thermometers are mainly used to monitor the temperature of the water in your aquarium. In certain circumstances, you can even check the temperature continuously so that you are notified when it falls or rises above your selected temperature setting or limit.

If you have a large tank, you can monitor different regions of the aquarium using multiple thermometers. Just keep in mind that the temperature indicator is visible so you can tell what the temperature is instantly.

What to look for in an aquarium thermometer – Buying Guide

There’s more to choosing a thermometer than looks. Here are some things to think about.

Installation process

Most thermometers are relatively simple to install. However, some require you to get a little wetter than others. Some you can stick on the outer glass, while others need you to stick your entire arm in the tank or even partially drain the tank to reach the correct location.

None of the thermometers I tested were complicated to install, but I wanted to factor installation into the rankings. Fluval EDGE Digital Aquarium Thermometer is very easy to set up and relatively easy to maintain as well.

Temperature reading

This is most likely the most significant feature of a thermometer. Who cares if it’s simple to install and easy to read if it’s giving you the incorrect temperature?

And, because a 3°F change might have a significant influence on your tank, you want the most precise measurement possible. Generally, one can consider a temperature resolution of about 1°F.

capetsma Touch Screen Fish Tank Thermometer is an excellent thermometer and gives you the most accurate temperature reading.

Longevity of the device

Even though thermometers are typically affordable, you want something that will last and remain accurate. Look for materials that are long-lasting and have decent battery life.

If you buy a traditional mercury thermometer, make sure it won’t crack or shatter and that it’s entirely submersible.

Leaking mercury into your tank will have disastrous consequences. It should include a probe connected to an LCD with digital aquarium thermometers. It’s always a plus if it comes with additional batteries.

Gain Express Digital Aquarium Thermometer is one of the best thermometers and offers longevity at a great price.

Temperature display and safety

Having a thermometer for your aquarium is meant for your fish’s comfort, and not all fishes have the same optimum temperature. While a heater can maintain the temperature of your fish tank, they don’t always have the display feature.

For that, you need a thermometer that can measure the temperature and display it for your convenience. To make things even better, it is great to have a thermometer with an alert system so that if by any chance the temperature exceeds your desired range, it may notify you.

Shyfish LCD Digital Aquarium Thermometer is one of the most versatile thermometers in the market. It measures the temperature and displays it on its LCD, and has an inbuilt alert system.


Which thermometer is suitable for an aquarium?

The capetsma Touch Screen Fish Tank Thermometer is great for any aquarium. It is long-lasting, accurate, and easy to maintain.

Are digital thermometers accurate in fish tanks?

A digital thermometer can provide an exact measurement of 0.1°F. Not only that but digital thermometers are constructed of plastic, which eliminates the risk of a glass thermometer shattering inside your aquarium.

Where should a thermometer be placed in a fish tank?

The most accurate and simple-to-read thermometers are stick-on LCD thermometers. Attach it to the outside glass, just above the gravel, at a location that will not be influenced by direct sunlight, a heater, or other heat sources. Place it at the opposite end of the fish tank from the heater if possible.

Is an aquarium thermometer required?

We recommend using a thermometer in every aquarium, regardless of the type. Temperatures should be recorded regularly to verify that the aquarium water temperature is steady and within the appropriate range for your fish.

Our Verdict

This article has examined the ten best aquarium thermometers to help you narrow down your search and put together the many different types of thermometers accessible to you, as well as their added features.

The capetsma Digital Touch Screen Aquarium Thermometer is the best choice for functionality and ease of use. An aquarium thermometer is essential whether you have a tropical fish tank or a marine environment.

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