1. Astigmatic design is applied to rugged surroundings; 2. Continuously gas concentration and composition LCD real-time display; 3. Rechargeable lithium battery (continuous working period can be 16~18 hours); 4. Concentration units ppm and mg/m3 can be switched 5. Built-in vibration alarm which is applied for noisy environment; 6. Two stage alarm threshold: the low alarm and high alarm point can be adjusted based on actual needs; 7. Simple automatic calibration program and plug-in replaceable sensor; 8. Fully functional self-testing: sensor, integrity of battery and circuit, acoustic & visual & vibration three-stage alarm; 9. Small figure and light weight; 10. Password protection capability: only the authorized user can modify the preset parameter.
