Compact size: portable gas detector, compact ABS body, drop-proof and dust-proof, fast response, detect leaks quickly, easy to carry and use. Semiconductor sensors of high precision: the use of high precision semiconductor sensor, with fast response and very fast reaction, allows more precise measurement. LCD display: color LCD display, suitable for Clear and visible data reading in low light conditions at night. With the concentration bar display function, it can automatically match the appropriate light color according to the measured concentration. Easy to use: concentration gas tester + dual-mode switching thermohygrometer, convenient for users to safely detect temperature and humidity, and test a variety of combustible gas types, easy to meet different testing needs. Measurable gas types (partial list) : Can detect a variety of gases, propane, ammonia, benzene, gasoline, hydrogen, natural gases naphtha, paint thinner, carbon monoxide, methane, ethylene oxide, butane, ethanol, ethylene, propylene, butene, acetylene, propyne , butyne, hydrogen sulfide, phosphine, etc.