Refrigerant Leak Detector, Refrigerant, 4 Sensitivity Level, 0.04 oz/yr R-134a, For Use With All CFC, HFCF, HFC, HFO Refrigerants, R22, R32, R134a, R404a, R407c, R410a, R422b, R448a, R449a, R452a, R452b, R507 (AZ50), R1234yf, Ammonia, SF6, and More,...