Works great! Now I always know at a glance what the temperature in the aquarium is. I had a heating failure and killed my fish. That's what prompted this purchase. Use tweezers to remove the Fahrenheit jumper on the back. I also saw a review that said he wasn't sure if the gauge lines were just for show or actually worked. I tested the probe's operation under tap water and you can observe the movement of the lined gauge. Very satisfied. I used velcro and attached it to the corner or tank.
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