1.All Halogenated Gas: Freon leak detector, HVAC halogen refrigerant leak detector triggers on R11 R503 R500 R123 22 R124 R114 and all halogenated refrigerants including HFCs, CFCs,HCFCs and blends 2.7 Adjustable Sensitivity: Turn the knob to open and choose the sensitivity level; The halogen refrigerant gas leak detector comes with both audible and visual indicators to help you easily detect any gas leak, HVAC tester ac sniffer is enough to self check auto AC or air conditioning and other 3.Accessible Leak Detector Design: The halogen gas leakage tester features a flexibly adjustable probe, making air condition refrigerant leak detector easier for you to detect leaks even in small or hard to reach areas, thus enhancing the capabilities of your leak detection tools 4.: Choose suitable sensitivity and then extend the probe to the place to be detected; If there is refrigerant flowing out, HVAC refrigerant freon leak detector, AC sniffer leak detector will make a sound and the indicator will flash quickly; After use, turn the knob counterclockwise to turn it off