Pinpoint American Marine Calibration Thermometer - Aquarium Temperature

It's been more than a month since I first use it and I wanted to wait that long before I make a review. It was okay at first, I didn't have to do any calibration as the readings stayed about 0.1 to 0.2 degrees celcius off against my other calibrated digital thermometer. But after 2 weeks, I noticed that the readings started to drift more and more off my other thermometer. It came to a point where the difference is about 2 degree celcius off! Now, I have to calibrate it once I week to keep the readings in check.

Not calibration thermometer but the remote

I thought this was poor for the amount of money it costs. I had two tanks and using the garage door opener would throw off the readings. There are much better alternatives for a lot less money

Had two probe monitors in the tank approximately 4" apart and got readings 3 degrees different. Not at all accurate. Disappointing that the $2 thermometers are the better alternative.