CO Meter and Gas Leak Detector Carbon Monoxide Meter Sensitivity 100ppm Of R- 134a/ R- 22 LA-3303 Refrigerant Leak Detector CO Meter and Gas Leak Detector Carbon Monoxide MeterThe Refrigerant Leak Detector detects all CFC refrigerants such as R-22, R-124, R-11 and R-12. The ultra-sensitive long life sensor detects the more current, difficult-to-detect HFC refrigerants such as R-134a, R-404A, and ...