Features and Benefits: 0.10 oz (3 gm)/year sensitivity Equally sensitive to all refrigerants, including R-22, R-134a, R-404a, R-410a, R-507 (AZ-50) and all CFCs, HCFCs and HFCs 800 hour infrared cell life for low cost of ownership Infrared cell does not weaken over time, so response remains consistent and accurate Selective to refr....(more info)