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/min Gas resolution 1%/1PPM Gas measurement range 50-50000PPM/0-100% (based on methane) Charging interface USB Type-C USB charging 5V/1A Power supply built-in 18650/2000mAh/37v Charging time: about 4h Measurement accuracy Less than +%5LEL, Less than +500PPM 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 0-70%RH Storage environment -10~50C (5%---95%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.