I would like comments on the subjet:
We have an intern discussion at the office on the reliability of our compound gauges calibration between two methods use for refrigeration gauge calibration.
The first method is to first use the atmospheric reference, adjust the needle using the adjustment screw, and then take a room temperature cylinder of R134a (containing two phases fluids: gas and liquid) and use the calibrated gauge to verify if the pressure of the cylinder correspond to the chart pressure-temperature of the R134a
The second method is to use a “death weight” calibration tool.
I think to first one is quite reliable, because it do not need calibration. The death weight should be calibrated, to maintain reliability.
Please comments?

Best regards