I have a new set of 4 valve cps gauges. I have been told numerous times the way to calibrate is to connect to a jug of r22 or 410a, tape a thermocouple to a jug of said refrigerant and match the saturation temp to the thermocouple temp. When I did this the gauges no longer read zero. I'm just looking for re assurance and confirmation of this method. This set was 180.00 and it drives me mad. I don't want to spring for digital just yet.
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