The Amprobe GSD600 Gas Leak Detector is a compact, high-sensitivity sniffer designed for residential HVAC technicians, gas fitters, and commercial maintenance mechanics. Built to detect combustible gases like methane, propane, and natural gas down to 35 ppm. With a fast warm-up cycle, a multi-LED visual concentration display, an audible tick rate indicator, and a standard earphone jack for loud mechanical rooms, the GSD600 provides quick, pin-point leak isolation on black iron pipe and appliance connections...