I have had a ThermoPro Thermostat model TP-55 for quite a while and have been annoyed with it’s readings being obviously off. I compared it’s readings with diagnostic devices and found that it was giving two degrees too high. I then downloaded it’s manual and can not find any method to calibrate it’s readings. I then calibrate the device by attaching a label showing how far the readings are in error. I just might donate this unit as I despise inaccuracy.