Yosoo Halogen Gas Freon CFC HFC Refrigerant Leak Detector HVAC R134a R410a R22a Test all contain halogen's refrigerants Adjust sensitivity, all instruments can automatically adjust to the optimum detecting state; Built-in voltage, high precision and using ultra-low power IC design, make the work is more stable This Detector is a boot reset and automatic follow function, can ignore the environment halogen gases concentration level USES the high quality sensors, the work high sensitivity, long life expectancy This product has the function of the sensitivity stepless speed regulation, can adjust in testing