Which controller would youbtrust

bighead

New member
I have a single stage Ranco temp controller set at 77 connected to my heater

I have a finnex temp controller connected with no heater and reads 80

Which one would you trust
I am using the finnex fir the alarm function on it
 
Neither, I have a good lab grade thermometer that I use to calibrate all my other thermostats and thermometers with.
 
I would compare them to a trusted thermometer. If I remember correctly the Ranco directions were +/- 1 degree on the reading.
 
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