The Yellow Jacket 69310 Combustible Gas Leak Detector detects combustible hydrocarbon gases (e.g. natural gases, LPG). Readings are digitally displayed in PPM, % Vol., and % LEL with a rapid response time. The user selected parameters appear on the LCD display which also shows the measurements in a bar graph ranging from 0 to 100% of full scale. The 69310 unit features a convenient auto-zero drift adjustment and audible and visual indication in case of alarm. The flexible 11 in. wand (for hard-to-reach leaks) has the gas sensor mounted at the end for detection of low concentrations of hydrocarbons in gas appliances and pipes. To save battery power during operation, this detector features an autozero and auto-shut-off function.