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The large dial under my hand is a scientific thermometer it is very accurate (traced) and very costly... It is clear that 23.4ºC is correct and the majority are in that 23.2-23.6 range basically correct. the fluckers and exoterras clearly are wrong and the ir gun is way way wrong (reflecting issues) at a whopping 13ºF high. (illustrating that IR guns do reflect off glossy surfaces and can be exceptionally incorrect when not understood.)

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Same science grade thermometer (26.9ºC = 80.42ºF) The hydrofarms read 83.8,82.4 and 81.6. Clearly in error. I had returned two of my accurites because they were beyond the designed specs (2ºC+/-) my third replacement was just inside the specs at 1.6ºC (about 2ºF) I gave it to my father as I will not 'live' with two degrees in error.