A pressure gauge can be checked by
A. connecting it to an operating refrigeration system and comparing the pressure with the manufacturer’s recommended pressure.
B. connecting it to a cylinder of refrigerant with a known temperature and comparing the pressure reading with that on a temperature/pressure relationship chart.
C. connecting it to an operating system and comparing the pressure reading with the subcooling temperature.
D. connecting it to an operating system and comparing the reading with that of a megohmmeter.
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