The 10 Best Aquarium Thermometers

This Review has been updated 15 times since it was first published in October of 2016. If you want your fish and other aquatic critters to thrive, then you must maintain a stable temperature in their environment. Aquarium thermometers are an easy way to do that and require little maintenance. From digital to old school displays and a variety of different mounting styles, there’s sure to be one here that fits your specific needs. When users buy our independently chosen editorial picks, we may earn commissions to help fund the Reviewpp. Skip to the best aquarium thermometer on Amazon.

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The 10 Best Aquarium Thermometers

10. Zacro Digital

The Zacro Digital uses an unobtrusive probe that dangles inside the tank while the unit itself attaches to the outside with a suction cup. It can measure temperature in either Fahrenheit or Celsius, and it comes in a pack of two.

  • Large display is easy to read
  • Lr44 battery is included
  • Suction cup is not very strong


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9. JW Pet Company

If you’re looking for something that is not digital or high tech, the JW Pet Company is a dependable choice without any of the bells and whistles. There is a green safe zone that illustrates an optimal temperature range, but the numbers are small and a little hard to read.

  • Freestanding model available
  • Installs with a strong magnet
  • Condensation may form inside it


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8. Pet Magasin

Designed for both aquariums and terrariums, the Pet Magasin is a cool gadget that can monitor temperature and humidity levels to help you create the most comfortable habitat for your pets. Plus, its large display can be clearly seen from a distance.

  • Lightweight and compact
  • Comes with a 2-year warranty
  • Battery can be hard to change


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7. Corner Biz Aquarium

The Corner Biz Aquarium enables you to check the temperature quickly whenever you look at the tank, so you’re always sure your fish are safe. It works like a charm and is a cinch to place just about anywhere thanks to its traditional suction cup design.

  • Doesn’t require any maintenance
  • Unobtrusive slim profile
  • Adheres to glass and acrylic tanks


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6. Lifegard Big Digital

Equipped with four alert features and a large easy-to-read LCD, the Lifegard Big Digital makes a standout choice for your aquarium. It has a wide temperature range, from -58°F to 158°F, and constantly monitors both water and room temperature to keep your fish safe.

  • Audible and visual alert modes
  • Two-year battery life
  • Pricier than most other options


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5. BOYU BT-08

With the BOYU BT-08 you can achieve the perfect environment no matter what type of fish you own. It’s made from a high-quality plastic material that prevents any water damage to the unit and has an integrated probe for a hassle-free setup.

  • Stylish heart design
  • Ideal for both salt and fresh water
  • Suction cup isn’t super reliable


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4. LCR Hallcrest A-1005

For a no-fuss way to check your aquarium’s water temperature, turn to the LCR Hallcrest A-1005. Its straightforward stick-and-peel design can’t get any easier to install and it takes the guesswork out of whether your fish are living in a healthy environment.

  • Display is easy to read
  • Simple to remove and reattach
  • May stop working in a year or so


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3. American Thermal BC002008

The American Thermal BC002008 is a simple and inexpensive tool designed for use outside the tank and below the waterline. The fully calibrated thermometer uses sensitive color changing liquid crystals to immediately display the temperature.

  • Promptly reacts to any temp change
  • Strong adhesive keeps it in place
  • Discreet and unobtrusive design


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2. General Tools AQ150

The General Tools AQ150 features a high and low temperature alarm that helps you keep the water in a desired temperature range. Its backlit LCD is easy to read in all light conditions and its long probe cord means it will work with almost any setup.

  • Displays in fahrenheit and celsius
  • Also works in terrariums
  • Runs on 1 aaa battery


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1. Vee Gee Scientific

When you need the tank temperature to be accurate to a tenth of a degree, the Vee Gee Scientific is an ultra-precise, probe-style choice that is not strictly limited to aquariums. Designed for laboratory use, it is sure to please even the most finicky hobbyists.

  • Comes with protective sheath
  • On-off switch preserves battery life
  • Head swivels 180 degrees


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