Signstek Portable AC Refrigerant Halogen Gas Leakage Detector Tester with High Sensitivity Excellent sensor with high sensitivity,3g/yr (0.1oz/yr), detect All KINDS OF halogenated refrigerant 14 inches (35.5cm) flexible stainless steel probe can reach to almost any tight space Single color LED display with 6-level leak alarm, tricolor display of battery voltage Real time sensitivity and RESET time sensitivity adjustment, One extra spare sensing tip included Tricolor display of battery voltage(Green, Orange & Red). Detects All KINDS OF halogenated refrigera Detect leaks in air-conditioning, freezing systems and responds to ALL halogenated (containing chlorine or fluorine) refrigerants, including:*CFCs: R12, R11, R500, R503etc. *HCFCs: R22, R123, R124, R502etc. *HFCs: R410a,R134a, R404a, R125 etc. Detect Ethylene Oxide gas leaks in hospital sterilizing equipment. Detect SF-6 in high voltage circuit breakers. Detect most gases that contain Chlorine, Fluorine, and Bromine (halogen gases). Detect cleaning agents used in dry cleaning applications. Detect halogen gases in fire-extinguishing system. <span class="a-text-bold">Note: </span>Reset function: before using this product every time,please be sure that press Reset Button for 1 second in fresh air, the direct light will become orange for 2 second, means that you complete the reset function,then you can continue to use it. Maximum sensitivity: 0.1 oz/yr (3g/yr) for all halogen refrigerants Working Mode: Continuous and no limit Reaction time: Instant Resetting time: 2 seconds Warm-up time: About 6 seconds Sensor tip life under continuous operation: More than 50 hours in normal detecting status Power Supply: 3V DV, Two-cell C Alkaline batteries Probe length: 14&#034; Dimension: 9 1/2&#034; x 2 1/2&#034; x 2 1/2&#034; Weight: 0.6kg