[All Halogenated Gas] Freon leak detector triggers on R22, R134A, R404A, R410A, R1234YF and all halogenated refrigerants including HFCs, CFCs,HCFCs and blends. | [7 Adjustable Sensitivity] Turn the knob to open and choose the sensitivity level. Maximum sensitivity up to 0.21oz/yr, which is enough to self -check auto AC or air conditioning and other. | [Multiple Indicators] Equipped with Audible and Visual gas leakage indicators and dual battery indicators. | [Turn On and Use] The electronic refrigerant leak detector response within 3 seconds. Warm up in 6 seconds, the shortest time in gas detectors. | [7.9-inch probe] A flexible probe allows detections in difficult and hard-to-reach areas. 24/7 US Technician Support via Email and Phone.