Halogen Leak Detector HD02C stands out among HVAC refrigerant leak detectors by combining high sensitivity with modern rechargeability. It detects R22, R32, and R134a with a resolution of 1 PPM over a 0–1000 PPM range, and sounds an alarm at a default threshold of 600 PPM via beep, screen display, and red backlight — ideal for spotting small leaks before they turn serious. A Type-C USB interface mean you’ll spend less time replacing batteries. A high-sensitivity sensor reacts in under 10 seconds after a 30-second preheat calibration. With display clarity, reliable alarms, and automatic shutdown after 10 minutes, this device delivers rapid leak detection, reduced downtime, and increased safety for HVAC system maintenance.