Amprobe GSD600 Gas Leak Detector Detects leaking gas in closed piping systems Semiconductor sensor detects methane and propane .Response time: 	less than 10 seconds Warm up time: less than 60 seconds Flexible stainless steel probe provides access to hard-to-reach areas Audible buzzer and a display panel with light-emitting diodes (LEDs) indicate presence and concentration of detected gas Automatic calibration at start-up helps ensure accuracy