The instrument automatically calibrates with a 30-second countdown when it is turned on, and has a built-in 18650 battery. Move the instrument probe slowly to the location where there may be a gas leak to measure Complete functions to quickly detect leaked gases and prevent safety hazards The scope of products: The detector is suitable for gas pipeline leak detection and household gas prevention, Oil and gas mining, tunnel and mine operations, chemical industry, metallurgy, refining, perfect testing instrument for biochemical medicine and other industries Flexible metal hose: The lengthened flexible probe is flexible and can easily cope with various complex measurement environments. Detection gas: natural gas, coal gas, liquefied petroleum gas Detection flow rate: 1L or min Gas resolution 1percent or 1PPM Gas measurement range 50-50000PPM or 0-100percent (based on methane) Charging interface USB Type-C USB charging 5V or 1A Power supply built-in 18650 or 2000mAh or 37v Charging time: about 4h Measurement accuracy Less than andpercent 5LEL, Less than and500PPM Sampling diffusion Response speed 2 seconds Calibration : automatic calibration within after power on Automatic shutdown about 10 minutes Display LCD Alarm mode: sound, vibration, screen display Warm-up time Working current: about 185mA Working temperature 0-50C Working humidity 0-70percent RH Storage environment -10-50C (5percent - -95percent RH) Flexible metal hose length 270mm Colour:Black Material:plastic Package Contents: 1 x Combustible Gas Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.