Standard Refrigerant Temperature Scales:
R12 = R12/R22/R502
R22 = R22/R134a/R404A
R134a = R134a/R404A/R507
R410A = R410A
R410A-FG = R410A/R134a/R22
Standard Pressure Scales:
R12, R22 and R134a gauges:
Low side 30″ vacuum up to 120 psi, retard protection to 350 psi
High side 0 psi up to 500 psi
R410A gauges:
Low side 30″ vacuum up to 500 psi