* High quality sensors with excellent sensitivity and repeatability; * 3 Navigation button, user-friendly interface and easy to operate and maintenance; * Digital LCD with English/Chinese display interface and human voice prompts support switching between Chinese and English; * Built-in 1800mAh large capacity lithium battery, support continuous working time over 10 hours; * mini USB charger interface (a charger with USA, Europe or UK plug is optional); * Sound-Light-Vibration three-mode alarms with human voice prompts and alarm point is user resettable; * With self-calibration and zero calibration functions, makes the measurement more accurate and reliable; * High-strength engineering plastic housing, IP65 protection degree with waterproof, dustproof and explosion-proof.