How trustworthy are the thermostat temps?

[Kaorte]

surface temp is always different then ambient. even probes cannot get a 100% true surface temp reading.

i notice the same thing but, believe me the temperature gun is accurate. i saw a thread about htis 2 weeks ago as well.

I am not asking if the temp gun is right. It gives me erratic readings, and I don't trust it. I am asking how reliable the thermometer built into the thermostat is.