SMART SENSOR 4 In 1 Explosion-Proof Gas Concentration Detector 1. Carbon monoxide: 0-1000 ppm 2. Hydrogen sulfide: 0~500 ppm 3. Oxygen: 0-30%VOL 4. Combustible gas: 0~100%LEL 5. Alarm settings: upper and lower limit alarm valuesSTEL alarm valueTWA alarm value 6. Zeroing and calibration: supported 7. Time display: date and time 8. Language display: chinese and english 9. Operating current: 230 mA 10. Sensor principle: electrochemical, catalytic combustion 11. Display: 2.4-inch dot matrix color display 12. Protection rating: IP65 13. Battery: built-in 3.7V 3500mA lithium battery 14. This instrument detects carbon monoxide, hydrogen sulfide, oxygen, and combustible gases with excellent sensitivity and accuracy, a short response time, and precise, professional measurements. 15. The instrument provides triple alarm prompts: beep, flash, and vibration. 16. The instrument supports lithium battery charging and can operate for 16 hours without alarms. 17. Connect the instrument to a computer via a Type-C data cable to view measurement data, perform real-time measurement communication, print, import records, and export to Excel. 18. Supports brightness adjustment for clear reading even in dark environments, making measurements more convenient and faster. 19. Sleep mode saves energy; the instrument automatically shuts down after 10 minutes of inactivity. 20. Metal back clip design for easy carrying and secure attachment. 21. Type-C charging interface with built-in rechargeable lithium battery. 22. Anti-slip design prevents slippage and damage. 23. Weight: 255g 24. Dimensions: 82x68x149mm