Xikar Digital Hygrometers: The Xikar 837Xi-2 is the easiest way to remotely monitor your humidor without even opening it. This nifty little gadget pairs with up to 3 Purotemp Sensors (Sold Seperately) to monitor up to 3 different Humidors at the push of a button but can also be used as a standalone hygrometer.
Hygrometer Calibration The new Xikar hygrometer does not need calibrating. It automatically calibrates itself. We began using these hygrometers in The UK Tobacco humidors when they were released and have never looked back.