Auto shutdown: Automatically turn off after 4 minutes when there is no operation High precision: Super precision result, high and low sensitivity can be switched by the "S" button Gas leak detection: Measured along the center of the gas stove, the gas concentration does not exceed 20% LFL, no warning light and alarm sound, which means it is safe Gas water heater detection: Detect along the water heater gas pipe. When the screen concentration indicator simulation segment rises, the prompt light is on, and accompanied by a rapid buzzer alarm, the current position is the gas leak Gasoline cyclopentane hydroxyl leakage detection: Detect the car engine tank to shorten the diagnosis time and improve the vehicle maintenance efficiency Specifications: Response range: 50~1000ppm (methane) Battery: AAA*2 (not included) Warm-up time: 30 seconds Sensor: Gas-sensitive semiconductor Sensitivity: about 500ppm: about 2 seconds Auto-off mode: No operation within 4 minutes, it will automatically shut down Package included: 1 x Combustible Gas Detector 1 x English User Manual Other items not include