Halogen Leak Detector HLD-100+ Refrigerant Gas Leak Detector R134a R12 R22 R600a Detects Halogen leak, such as R134a, R12, R410a, R22 and R600a etc. Monochromatic LED display with six-level leakage alarm. Convenient and fast reset function. Real-time flexibility with vari-speed adjustment . Tricolor battery voltage display.