〖Big LCD Screen Display with switchable Backlight Function〗High density Large LCD display with switchable backlight, you can still read the measured value in dark areas. Ammonia Meter and Ammonia Detector Rechargeable Gas Tester SMART SENSOR Handheld Ammonia Gas Detector Digital NH³ Gas Tester 0 100ppm Ammonia Gas Meter With Large Lcd Display I5251060289 0-100 PPM Sensor A compact, high-precision gas monitoring device designed to detect ammonia leaks in industrial and hazardous environments 〖Alarm Function & Alarming level is Adjustable〗The meter will alarm when the meter measurement value reach the preset value Meanwhile,alarm level can be adjusted based on your specific requirements, details please see the user manual. This fixed gas safety monitor measures NH3 levels between 0-100ppm and detects hazards in order to protect facilities from overexposure 〖High Senstive Sensor & Accurate Measurement〗Digital gas detector for detecting Ammonia(NH3) gas concentration,0~100PPM measurement range with 0., 1ppm resolution and 0., 5ppm measurement accuracy .