1. Applied to household coal gas self-inspection and self-inspection 2. It is convenient for users to safely detect various combustible gases, such as methane, carbon monoxide, gasoline, ethylene oxide, etc. 3. Imported gas-sensitive semiconductor sensor is adopted, with low power consumption and good stability, so as to realize high-precision measurement 4. Measuring range: 50~1000ppm 5. Measurement accuracy: 30% 6. Voltage: 3x1.5V 7. Resolution: 0.1 8. Size: 140mmx28mmx58mm 9. Weight: 0.213kg 10. Power supply: 3xAAA