feature: 1. Gas leak detector + thermometer and hygrometer Besides measuring gases, you can also measure ambient humidity and temperature. 2. Precise numerical values | high sensitivity and low sensitivity | quick response 3. Test a variety of flammable gases to meet different needs. It is convenient for users to safely detect various combustible gases. 4. Automatic shutdown After approximately 10 minutes, the instrument will automatically turn off. 5. Drop-proof, dust-proof and waterproof ABS material, comfortable to hold. specification: Combustible gas detection: 50~ 1000PPM Temperature detection: -20C~60C (-4F~140F) Humidity detection: 0.0% ~ 99, 9% d = relative humidity Display: LCD screen Auto power off: yes Low battery indicator: Yes Backlight tricolor: Yes Audible alarm: yes Power supply: 3 1.5 V AAA batteries (batteries not included) Package Included: 1 * Combustible Gas Detector