Review on Aquaneat Aquarium Thermometer Terrarium Batteries Fish & Aquatic Pets by Ben Boulanger

55 gal and 22 gal. They are very convenient and I check them every day by using take the display off the suction cup so I don't have to bend down to look at the readings. One day I had some concerns when one of them was quite low (turns out that was the low temperature I had my home thermostat set to at night) and I read reviews of aquarium thermometers. There were people talking about no calibration and big variations within this product line so I bought three more plus a slightly more expensive KETOTEK digital thermometer and placed four of those plus a glass thermometer in one of my tanks with the sensors next to each other friend. After an hour the readings were as follows: Aquaneat: 80.8 81.1 81.3 81.3 KETOTEK Digital Thermometer 80.4 Glass Tank Thermometer 82 I always thought a glass thermometer would be the most accurate but now I'm not so sure secure. Aquaneat is fairly consistent, with only a 0.5 degree difference between the 4 samples, while KETOTEK is significantly lower than all the others. While I doubt such an inexpensive product is calibrated, I'm happy with the fairly accurate readings. I think I'll stick with the Aquaneat and scale down the tank a bit as it seems a bit bigger than I'd like.