Penn-Plax AquaLIFE Therma-Temp Digital Aquarium Thermometer, 2-in

By Penn-Plax
Rated 3.0833 out of 5 stars
$3.51Chewy Price
In Stock
FREE 1-3 day delivery on first-time orders over $25

About This Item


  • Thermometer mounts conveniently on the outside wall of aquariums.
  • Pressure-sensitive backing for easy application.
  • Numbers are clear and easy to read.
  • Green color shows the correct temperature of the water.
  • Keeps your finned friend’s home at a comfortable climate.

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Frequently Bought Together

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$12.44Chewy Price

Save Extra 25% Off at Checkout

Total Price: $26.34

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Fish TypeBettaBetta, Bottom Feeder, Cichlid...Tropical Freshwater
Aquarium TypeFreshwaterSaltwater, FreshwaterSaltwater

Questions & Answers

6 Customer Questions

Someone asked this but it was not answered. Will this work on an acrylic aquarium?
Answer by ChewyMay 05, 2020
This thermometer is intended to be mounted on the outside of glass aquariums.

Can I use this theremometer for a gecko tank?
Answer by ChewyMar 09, 2020
This thermometer is designed for reading water temperature in an Aquarium.

Does a alarm go off if water gets to low.
Answer by ChewySep 30, 2019
This thermometer is intended to show the temperature of your aquarium.

Can this thermometer work on a curved bowl?
Answer by ChewySep 13, 2019
This thermometer is meant to sit flush with a flat surface and is not meant for a curved or uneven surface.

ReviewsWrite a Review

Rated 3.0833 out of 5 stars
24 Ratings
Would recommend to a friend

24 Customer Reviews

Rated 5 out of 5 stars
By Dove on Feb 20, 2023

For those who get no reading

I've used these for years and have never had a problem with them. They are awesome. I have seen a lot of reviews that say it doesn't show any reading. My thoughts are your water temps are either too low or too high when you were trying to use these strips. You can test it against a floating thermometer initially to get the right range if this has been your experience. Your temps may be just out of range of the strip.

Rated 1 out of 5 stars
By Cm on Jul 8, 2023


Didn't work

Rated 5 out of 5 stars
By GuineaMom4 on Sep 14, 2022

Works great!

I love the size of these they work great I have bought 6 of them so far and they all work great there small and effective for sure !

Rated 5 out of 5 stars
By Urbansgal on Dec 5, 2021

Compact thermometer

I initially bought this as a back up for another stick on thermometer. It's a great size for smaller tanks and it's easy to read

Rated 5 out of 5 stars
By Lane on Dec 9, 2021

Works perfectly

Just what I needed for a small tank. Lets me know if I need to go up or down

Rated 1 out of 5 stars
By jimbo on Oct 7, 2021

You get what you pay for

Did not work for me. No big deal my heaters have huge temp readouts and not needed. I never did get a temperature reading

Rated 1 out of 5 stars
By 40OF on Sep 11, 2021

Aqua thermostat

Doesn’t work like I thought it would. Is hard to comprehend. Will not buy another or anything like this one.

Rated 5 out of 5 stars
By MJ13 on Jul 21, 2021

Great fish tank thermometer

My fish kept breaking my glass thermometer on the inside of my tank. This thermometer works great and I don't have to worry about my fish breaking glass in their tank.

Rated 5 out of 5 stars
By Catsofmany on Apr 26, 2021

Happy with this thermometer

I don’t know why there’s so many negative reviews about this thermometer. I’ve used them for years with the oldest still in use being 8 years old. I have 6 tanks. 120 gallon, 55 gallon, 30 gallon, 20 gallon, 10 gallon and a 5 gallon. I have an expensive salt meter that also reads temperature and have checked the readings with this little stick on thermometer. When the stick on reads 79, the meter reads 80. Close enough that I’ll know if a problem arises with my heaters. I find the glass thermometers annoying, hard to read and not something I want in my tank with my 9 inch Tin Foil Barb. I’ve ordered a few more for my newest tanks.

Rated 2 out of 5 stars
By Temp on Aug 14, 2021


I have the thermometer on the tank and it still has not registered the temp of the water. I do not recommend