The ZooMed thermometer/hygrometer combos aren’t too bad, you just have to be careful not to let water get inside of the humidity probe, or they’re prone to failure. If they’re reading at 99% constantly regardless of the moisture level, or the temperature is reading considerably off, either the battery may need replaced or it indicates a failed probe. Lugarti also makes an excellent combo meter, with an alarm setting you can use to keep within target temp/humidity ranges as well, but they’re a bit more than the ZooMed or VE options are. Using an IR temperature gun is the most accurate way to monitor spot temperature in an enclosure or rack system, though, and you can verify the accuracy of your probe based thermometers with one, as well, eliminating any guesswork based on variations with the probe/thermometer and the possibility of failed equipment.
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