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All the Zoo Med and Exo Terra hygrometer/thermometers are highly inaccurate 10-20%RH off. I know because I compared them with actual calibrated humidity sensors.

I recommend the Acurite Indoor Humidity Monitors which can log daily min/max humidity and temperature values. They are $9.85 each at Home Depot's Garden section.

Another good humidity gauge is the Hydroset II which can be found on for around $18. The Hydroset II is user-calibratable as well. You can buy a calibration kit for $5 and change the humidity settings yourself using a simple dial knob.

I've tried all the Zoo Med and Exo Terra ones and these are the only two that I know are accurate.
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