... .Quickly&automatically determines the weight concentrations of R12, R134a, R22, hydrocarbons and air. 2.Easy&profitable to use Features: ... technology to determine the weight concentrations of R12, R134a, R22, hydrocarbons and air."Blend-ID" analytical software identifies all EPA ... and LEDs, Optional printer module (Internal)Refrigerant : R12, R134a, R22, HC, and EPA S.N.A.P. approved blendsDisplay: ...