I keep to glass stick ons in my tank, then check the accuracy with a lab grade pH tester that has a built in thermocouple. I have found they usually stay accurate for a year or 2. There are remote sensors that you stick the probe in the tank and it uses RF to transmit to a reader, but like stated above, it's not that accurate.
Technology like that isn't cheap, so if you see something like that which is cheap, they probably skimped on something else... like the quality of the thermometer
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