I have a brinsea octagon 20, it has a digital reading of the temperature. I decided after a bad hatch to check the temperature and humidity by putting in 2 different thermometers ( BOTH BRAND NEW) and they are all giving me different readings!!!. The thermo on the brinsea is reading 37.6, the new digital is reading 36.0 and the glass thermo reading 39.0. How do i know which is right??. Any way of working out which 1 is right?.