I put all the thermometers side by side, put all their probes in the same little tank and watched the thermometer readings. I watched her for about 30 minutes. Temperatures never matched at all. Not once. The one I've had in my 10 gallon tank for the past week just flashes 77.7/78.6 all the time. Bad news comes from the thermometer. Of course, if you want a general idea of what your temperature is, buy it. If your fish's welfare depends on it, they're pretty much useless.
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