That link probably has the instructions i need. It is obvious because at rest in a 20 degree room it is showing 40 on both sensors, and increasing bed temperature to 50 barely warms the plate. Will go thru the instructions and respond if need help. thank you.

Hello sorry a newbie here, got duet wifi on ender 3. Mostly seems fine except the temperatures thermistors are reading about 20 degrees C higher than they actually are, please advise how to calibrate this, thank you