I love these thermometers. I've never had one that didn't work. I can see the temperature as I walk past the tanks instead of stopping and looking at other digital thermometers. It is important that the battery is installed correctly. If the thermometer doesn't work, simply loosen the cap, insert the battery and tighten the cap again. The actual screen part of the device is 1 inch wide and 0.5 inch wide which makes the display quite large compared to others. Now I have 13 tanks and I bought enough to equip them all. Can't comment on durability but to be honest I don't expect an electric underwater device to last more than a year. Try them and you will be amazed.
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