It is widely used in safety inspection of gas transmission and distribution pipelines, pipeline maintenance and emergency leakage in cities and towns for gas, oil, petrochemical, oil depot, station service and fieldPetroleum and other departments. It can detect many types of gases, e.g. such as flammable gas, volatile gas, oxygen, ammonia gas, formaldehyde and VOL PM2.5, hydrogen sulfide, carbon monoxide, carbon dioxide, hydrogen,halogen gas etc. etc. The use of high-quality materials, strong and durable, has a long service life. Easy to use, just press and hold the power button for 2 seconds to turn on/off. The sensor adopts the principle of electrochemistry, can quickly find leaks and take precautions to ensure safety. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin