mine seems 20* shy of actual. I got a meat thermometer in the tent and it was reading 180*+ when my thermostat read 160*. Still working to figure out best place to have it to read accurately. Thinking of hanging it from the top given it has the hook slot built in.

Hey Bradley, to calibrate your thermometer you will want to use a flat-head screwdriver on the back and adjust the temperature dial to match the ambient air temperature outside of your tent.

Calibrating the hygrometer is a little bit harder. If you want to be as accurate as possible, try wrapping it in a very damp towel for an hour and checking it - it should be close to 100%. If it is not at ~100%, you can adjust accordingly or use it unadjusted knowing it is x° off.