Best Aquarium Thermometer Options in the Market

finding the best aquarium thermometer

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When you’re thinking about all of the items you need for your aquarium, you may have overlooked one small but crucial device, the thermometer! Depending on what you keep in your tank, type of fish and plants, water that becomes unsuitable could have detrimental effects. Changes can happen even when everything appears to be just fine.

We recommend using a thermometer for any tank you have, to track water changes over different days and times and to help correct any issues that come up. If you run a quick search for aquarium thermometers, you’ll find that you come up with a ton of conflicting and hard to sift through information.

There are three basic types of thermometers for tanks. Each is great for different things, models, and sizes of aquariums. The bottom line is that you need one and you should be recording water temperatures regularly. Doing so will help ensure that the temperature of the water is stable and staying within the optimal range for the type of fish you keep.

Prairie Essentials Instant Easy Read Adhesive Strip Liquid Crystal Stick On Thermometer with Red Display for Kombucha, Beer, Tea, Brewing, Fermenting and Aquariums (2)

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Product FAQs

1. What kinds of thermometer are there?

2. What are the pros and cons of digital thermometers?

3. What about the kind you stick on the tank (LCD)?

4. Are standing or floating thermometers any good?

How Much Can You Expect to Spend?

Owning an aquarium with wildlife, plants, and fish can sometimes become an expensive hobby. We understand you may be worried about how much you’ll spend on this little necessary gadget, but honestly, you shouldn’t sweat it. You can get a thermometer for as low as $3 to $10, but some of the most expensive products you’ll find can be up to $20.

How We Reviewed

Because certain types of thermometers are best for certain types of tanks based on style, size, and fish/plant life contained, we looked at which thermostats consistently provided accurate results, were durable, could face normal wear and tear, were easy to use and more. Be sure to skim our reviews of each product we found to be the best of its kind for details on why it was the top pick!

Our Top Picks

Zacro Pack of 2 LCD Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature
  • Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water).
  • Easy to apply suction cup and easy to read lcd screen; temperature readings to within 1 degree
  • Large, easy to read lcd display; compact design for discrete use
  • Temperature range -50 degree Celsius ~ + 70 degree Celsius; Operating temperature -10 degree Celsius ~ +50 degree Celsius.
  • Powered by one lr44 button cell (included)

This digital meter comes with the submergible probe with a display that on the outside of the tank. We love that it’s inexpensive. The screen is easy to read, the suction cups are strong enough to keep it in place, and it has a decent temperature range.

It needs just one lr44 cell battery, which you'll receive with the product. We found the temperature readings to be steady and accurate to within 1 degree. The chord is approximately 40 inches from end to end, and it does not include an alarm.

Rating: Other consumers loved this meter, rating it at 4.5 out of 5 stars.

POPETPOP LCD Digital Aquarium Thermometer High Precision Digital Waterproof Fish Tank Thermometer for Aquarium/Pond/Reptile Turtles Habitats (Blue)
  • TEMPERATURE - Temperature range is -20℃ ~ + 70℃. Temperature accuracy is ±1℃(±2℉). Update measured temperature every 10 seconds.
  • READINGS - LCD screen displays measured temperature which can be switched between ℃ and ℉, and it can save the maximum and minimum readings during past tests.
  • SCREEN - Large screen displays clearly, no dead corner on the left or right make it looks more beautiful. Besides, if you want a clearer screen displays, you can remove the screen protector.
  • INSTALLATION - Easy and convenient to install at fish tank with suction cup or spring clip that make sure space-saving and portable. You can put this small thermometer at anyplace you want to place. (Please only submerge probe, don't submerge thermometer in water)
  • MATERIAL - Eco-friendly ABS shell which is tough and hard. Excellent mechanical properties make the device safer, wear-resistant and stable. High accuracy with professional sensor, it can measure temperature more correctly than same product. Powered by two AG13 button cells (included).

This digital monitor has an impressive large screen with easy to read display. It also reads the temperature every 10 seconds for an accurate reading. It comes with an excellent temperature range though a little smaller than the Zacro mentioned above. It can be attached to the tank with a spring clip or a suction cup easily.

Its durable outer shell makes it durable, and it comes with the two AG13 button cell batteries it needs for power.

Rating: Consumers approve of this product, rating it a 4.1 out of 5 stars.

LCR Hallcrest A-1005 Liquid Crystal Vertical Aquarium Thermometer
  • Easy To Read
  • Mounts Vertically On The Outside Of Your Aquarium
  • Easily Movable

Whether you’re just getting started or wanting to replace your current stick on meter, this is a great choice. It comes with a vertical reading scale. Other consumers found that it had accurate readings on glass, acrylic and plastic tanks of varying thickness.

The size is approximately five ¼ inches by ¾ an inch. Be sure to read the pamphlet it comes with as it will explain the different colors and how to read an exact temperature.

Rating: Consumers are generally happy with this product, giving it a rating of 4.5 out of 5 stars.

Prairie Essentials Instant Easy Read Adhesive Strip Liquid Crystal Stick On Thermometer with Red Display for Kombucha, Beer, Tea, Brewing, Fermenting and Aquariums (2)
  • Made in the USA - Includes 2 Thermometers
  • Immediate response, Intuitive, Accurate
  • Easy to read red display with no confusing multiple colors to interpret
  • Self-Adhesive and moveable. Measures 5 inches tall by 1/2 inches wide
  • Temperature range 58°- 88° F (14°-31° C)

Prairie Essentials provides a great product. The thermometer has a reasonably easy read on it, that doesn’t come with multiple colors – which can be a drag for some people.

Each monitor is about 5 inches by a half inch wide, with a broad temperature range. In case you’re a fan of the dual measurements, this one only comes with the Fahrenheit reading.

Rating: Tons of positive reviews from consumers leave this monitor ranking with a 4.5 out of 5 stars.

Mundopet Floating Thermometer with Suction Cup for Aquarium Fish tank
  • Made of glass, small size and ultralight
  • It floats and is secured by a included suction cup
  • Easy to install, just drop it in the tank and attached the suction cup to the inside of the tank for easy and accurate reading
  • Clear and easy to read scale that tells you, unmistakably what the temperature is in both Celsius and Fahrenheit degrees
  • Being that this thermometer is inside the tank, it gives a much accurate reading of the water temperature than those placed on the outside

This ultralight, glass meter is small and suction cups to the side of the tank to keep it in place. It’s called a floating thermometer, but it stays in one place. It reads with both a Celsius and Fahrenheit scale, clearly and easily. We found the reading to be steady and accurate, as it sits inside the water.

This meter works well in tanks ranging from sizes of 10g up to 150g, with accuracy. You may want to consider that because it only suction cups at the top, the bottom of the meter can tap against the class as the water moves.

Rating: Consumers considered this to be an inexpensive, effect device, rating it at 4.5 out of 5 stars.

JW Pet Company Smart Temp Standing Thermometer Aquarium Accessory
  • Weighted aquarium thermometer
  • Fits securely in gravel
  • Unique anchoring fins Will not shift positions
  • Green safe zone indicates optimal temperature range

For those looking for a weighted thermometer that sits at the bottom of the tank, this is the one for you. As you know, having the thermostat too close to the bottom of the container can make the reading inaccurate, but that was taken into the consideration of the design.

The monitor is weighted and comes ready to sit snugly on top of the gravel. It also has an easy to read, colored, “safe” zone for quick and easy reading.

Rating: Consumers who purchased this device for their aquariums, were generally happy, rating it a 4 out of 5 stars.

The Verdict

All of these meters are excellent and useful devices. But we don’t love the suction cups used in floating thermometers or the sound of the instrument tapping the glass. We’re also not in love with adhesive thermometers because, well, the adhesive! We always revert to the digital meter, and we love the Zacro LCD Digital Aquarium Thermometer.

It's easy to use, easy to set up, and always gives a clear, accurate reading. The chord can be a bummer for some, but we didn’t have any issue coiling it up and hiding the excess behind the tank. It’s a safe, effective, and inexpensive monitor to choose.

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