Features: This product is a professional leak detection tool, used with fluorescent agents. After vacuuming, add enough phosphor in the air conditioning system to mix with the freezing oil. Then add snow, when the leakage point of the refrigerant leaks, and then the fluorescent agent will leak, when the blue light shines on the golden yellow fluorescent agent, it will show a bright golden yellow. Strong light, aluminum alloy casing, easy to operate, non-corrosive Long life, waterproof, never rust. Quick detection of leaks, suitable for leak detection in various air conditioning systems Notice: Add the fluorescing agent to the compressor and look it up through the flashlight. A car generally only needs to add 1 branch, and the air conditioning system requires 2 leak detectors. Specifications: Flashlight Color:Random Product Name: Fluorescence leak detector No fluorescence is shown, or the display is very light 1: system has no leakage 2: Insufficient use of fluorescer. Package List: 1x Glasses 3x Batteries 1x Fluorescent oil 1x Flashlight