HDE LCD Digital Aquarium Thermometer

Rated 3.6071 out of 5 stars
$9.99 Chewy Price
No Longer Available
This item may be discontinued. We're not sure when it will be available again.

About This Item


  • Easy-to-use digital aquarium thermometer includes a large easy-to-read LCD display.
  • Provides up-to-the-minute accurate temperature readings within 0.1 degree in both Fahrenheit and Celsius.
  • Suction cups affix the screen to the outside of your tank and the temperature gauge to the inside of your tank submerged in water.
  • LR44 batteries are included so you can start measuring temperature as soon as you open the package.
  • To turn the thermometer on simply press the “On” button and you’re ready to measure your aquarium’s temperature and ensure your fish’s health.

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Questions & Answers

16 Customer Questions

Can the battery be replaced?
Answer by ChewyJan 02, 2019
The thermometer includes LR44 batteries, which can be replaced.

Will this work with a aquatic turtle? Thank you...
Answer by ChewyMar 09, 2018
This product is intended to read the water temperature in all aquariums, including those for turtles.

Could you please tell me the highest temperature range this thermometer will register. Thank you!
Answer by ChewyJan 18, 2018
From Customer reviews it has been tested from 120 Fahrenheit to -7 Celsius. The average temperature you'd use it at is 76- 84 degrees.

How long do the batteries last if I always leave it on?
Answer by ChewyApr 02, 2020
This thermometer is made to stay on for consistent temperature readings. The battery life will depend on the specific LR44 battery used. Most have a lifespan of approximately 6 months - 2 years.

ReviewsWrite a Review

Rated 3.6071 out of 5 stars
112 Ratings
Would recommend to a friend

112 Customer Reviews

Rated 1 out of 5 stars
By Mariah on Dec 7, 2023

doesn’t work

i understand it’s a relatively cheap thermometer, but it didn’t work no matter what i tried AND i bought new batteries just in case and it still didn’t work

Rated 5 out of 5 stars
By MontanaGal on Jul 27, 2023


This is so much better than the floating cheapo thermometers. I think it’s accurate as it says the same temp as I set the Fluval heater to.

Rated 1 out of 5 stars
By GeordiWillow on Jun 7, 2023

Item contains chemicals

Chewy should make very clear when they sell products that contain harmful chemicals. Or, not sell them? Item contains chemicals known to cause cancer or reproductive harm.

Rated 4 out of 5 stars
By Dave on May 18, 2023

good, but inconsistancies between products

I bought two of these, as I have a few prior, and needed some extras... all are different by .3-.5 degrees off higher or lower... no big deal, but I wouldn't rely on a single unit without verifying accuracy...

Rated 1 out of 5 stars
By Dawn on Jun 19, 2023


It came with no battery and did not say what kind of battery it uses.

Rated 3 out of 5 stars
By Hanksmommy on Jan 20, 2023
Top 500 Contributor

Not accurate, but consistent

I bought two of these thermometers for 2 of my fish tanks and they are both 2 degrees off based on my heater's temp display and my temp gun. The thermometers are consistent, but not accurate. I still have them on my tanks and I like that it's in your face and easy to see, but I just know to read it 2 degrees lower than what it says

Rated 3 out of 5 stars
By Laura22 on Jun 23, 2022

Inaccurate but consistent

I've had this for 8 months now. It is consistently about 2.2 degrees F above the actual temperature according to two other thermometers that I have. Knowing that, it works for its purpose. The suction cup gave out completely after the first hour of use and has never worked since. I'd recommend this for ease of use but you'll need another thermometer for accuracy.

Rated 4 out of 5 stars
By Rulla on Jun 27, 2022

Helps me with the water

So i had my heater set on 86 in the water and it with light on it read it to be around 92/94 - With the light off it read to 91= SO this helps me gauge where the heater needs to be so I would not harm my pet.

Rated 5 out of 5 stars
By Gloria on May 20, 2022

Good Thermometer

I use these thermometers in my aquariums and when I'm changing the water in my tanks. The batteries last a long time and you can get readings in Centigrade and Fahrenheit.

Rated 5 out of 5 stars
By MikesTemperature1 on Jul 19, 2022

Mike's Temperature

I love the Temperature gauge I can easily look at it anise the temperature.