Refrigerant gas leak detection of CFCs, HFCs, HCFCs, and blends from 100 ppm to 3000 ppm 18-Inch gooseneck probe for easy access around equipment Visual and audible alarms increase with refrigerant gas concentration High (100 to 1000 ppm) and low (200 to 3000 ppm) levels of sensitivity settings; based on R-134A Automatic zero-point calibration at power-up, hold, mute, and low battery functions Auto-power off after 10 minutes of inactivity to conserve battery Conforms to EN 14624:2020 testing 6.6 -Foot (2 m) drop protection