Check the listing for details. HVAC Refrigerant Freon Leak Detector w/ LED Light AC Sniffer Leak Detector. Condition: New. Listed at 29.99 USD. HVAC Refrigerant Freon Leak Detector with LED Light, AC Sniffer Leak Detector for R134a R410a R1234yf CFCs HCFCs HFCs HFOsAbout the product:7 ADJUSTABLE SENSITIVITY - The freon leak detector comes with 7 adjustable sensitivities to ensure efficient and targeted leak detection; It has a maximum sensitivity of up to 0.21 oz/yr, which is sufficient for self-checking auto AC, air conditioning, and other systems; The real-time sensitivity automatically adjusts to the best detecting state, adapting to new concentrations from low to high VISUAL & AUDIBLE ALERTS - Equipped with audible and visual gas leakage indicators; 2 beeps per second when open, and the beeping frequency is up to 10 times per second when detecting the leakage gas; The light flashes increasingly when a leakage is detected; The LED light is normally green, indicating that the battery voltage is normal and suitable for continuous detection; If the LED light turns orange, it means the battery voltage is close to the limit and should be replaced immediately RELIABLE DETECTION - The refrigerant leak detector has a 6-second preheating and 3-second response time for rapid leakage identification, ensuring safe and reliable refrigeration system operation; The 7.9-inch flexible probe can reach almost any awkward corners or space for more accurate detection; Comes with a 2-in-1 pen flashlight, UV light cooperates with the fluorescent agent to quickly find the leakage point while the white light can brighten the dark places Note: We recommend turning on the leak detector and waiting for 6 seconds away from the potential leakage area USER FRIENDLY - The leak detector can detect refrigerant gases easily; First, Install 4*AAA batteries to the battery compartment; Then turn on the detector and wait for 6 seconds until it beeps; Adjust sensitivity from 1-7 levels according to your needs; When a leak is detected, a regular beep will change to a rapid beep, and the indicator lights will flash more rapidly; After use, turn the knob counterclockwise to turn it off Note: 4*AAA batteries are not included in the package WIDELY USED - The leak detector is capable of detecting leaks in a variety of refrigerants, including R11, R22, R134a, R404a, R1234yf, SF6, and all halogenated refrigerants, including HFCs, CFCs, HCFCs, HFOs, and blends; It can be used to locate leaks in air conditioning systems, refrigeration units, and other equipment that utilize freon or similar refrigerants; The device assists in the identification and repair of leaks, thereby ensuring the efficient operation of the equipment Product and Package Information:Max Sensitivity：0.21 oz/yr Item Size：5.9×1.4×1.4 Inches Response：