All of those temperature readings are fine. If you buy another thermometer, it may give you a completely different reading. I know a reefer that bought six different thermometers on a quest to get the most correct reading. He is still not happy. LOL
I've heard that the stick-on thermometers are not trustworthy. My heater thermometers are not accurate either. The only thermometer I trust is my 'Big Display' thermometer. I check it with a digital oral thermometer and it is pretty close +- .5 degrees.
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