Refrigerants Covered: R22, R134a, R404a, and R410a. Measures pressures from 0-500psia and temperatures from -40 to 400°F. Use the SSM1 to directly measure superheat or sub-cool by direct connections for temperature and pressure. The SSM1 is programmed with the most common four refrigerants, with data from the NIST-Pro refrigeration database for temperature-pressure values.