This portable pen-type gas detector can detect all kinds of combustible gases like methane, propane, natural gases, etc. With this tool, you can quickly and reliably detect combustible gas leaks on the gas pipeline, come on and try it, it won't let you down. Specifications: Material: ABS Sensor: Gas-sensitive semiconductor Power supply: 2 x AAA batteries (batteries not included) Reaction ranges: 50PPM (methane) Reaction time: Approx. 5s (=500PPM), Approx. 2 sec (500PPM) Alarm mode: visible and audible Operating conditions: 0℃~50℃, 20~80%RH Storage conditions: -10℃~60℃, 20~80%RH Package size: 215 * 55 * 45mm / 8.5 * 2.2 * 1.8in Package weight: 103g / 3.6ounce Note: The detection parameters only for methane. The parameters are only for reference for the detection of other combustible gases. Packing list: 1 * Gas Detector