Double Power Option: Choose battery powered ( HD02) or USB C rechargeable ( HD02C) models; both auto shut off and show low battery warnings for field use Multi Scene Application: Compact 300g design fits HVAC / fridge / cold storage inspections with included carry pouches, serving HVAC repair, industrial checks, and environmental Triple Alarm systems: Combines beeping sound, red backlight, and enhanced screen display with adjustable thresholds for clear leak alerts even in noisy environments, ideal for beginners Flexible 270mm Probe: The bendable hose reaches tight spaces like pipe joints and condensers for multi angles leak detections in confined HVAC maintenance areas High Sensitivity detections: Detects R22, 32, R134a and other refrigerants with 0-1000PPM ranges and 1PPM resolution, featuring fast response under 10 seconds to pinpoints leaks as small as 0.5Oz / year in HVAC or fridges, Manufacturer: sodeber