HT-2000 Digital CO2 Meter CO2 Monitor Detector Gas Analyzer 9999ppm CO2 Analyzers Temperature Relative Humidity Tester           Description:       It's used for measuring Carbon Dioxide concentration, temperature, humidity, dew point temperature and wet bulb temperature    Too much Carbon Dioxide indoor will easy cause tired, not concentration, even cause sick building syndrom. A good indoor environment will be benifit to body health and also improve body immunity, reduce the disease rate    Carbon dioxide meter also has important function in agriculture, such as vegetable greenhouse    Carbon Dioxide Meter is widely used in factory, workshop, green house, clean room, industry and agriculture, wine bar, hotel, hospital, shop market, airport, railway station, entertainment hall and movie theater etc         Key Features:      Supper large LCD simultaneously display and log Carbon Dioxide Level, Temperature, Relative Humidity, Calendar (Y/M/D) and Time (Clock)    12700 data logging memory    Warning CARBON DIOXIDE LEVEL    Stable NDIR sensor for Carbon Dioxide concentration    NDIR (Non-Dispersive Infrared) WAVEGUIDE TECHNOLOGY WITH ABC (Automatic back-ground Calibration)    High and low threshold setting    Back-light function    Recall Max and Min reading    Long time drift compensation    Comes with power adapter         Technical Specs:      Large LCE Display: 3.5” (8.9cm) LCD display with backlight    Logger Mode: Key stat/stop, Immediately, Schedule, Real-time & Roll-over    Carbon Dioxide Range: 0~9999(out of scale)    Accuracy: ±50ppm ±5%rdg (0~2000)    Response Time: 10sec    Temperature Range: -10.0~70.0C (14~158F)    Resolution: 0.1C/F    Accuracy: ±0.6C/±0.9F (0~50C/32~122F), others±1.2C    Humidity Range: 0.1~99.9%    Resolution: 0.1%    Accuracy: ±3% (10~90%)    Logging Memory: 40000    Operating Condition: 0~50C, 0~95%RH    Storage Condition: -20~60C, 0~99%RH    Sensor Life: 15 years in normal conm    Environments with ABC on    Storage Temp: -40~70C (-40~158F)    Power Supply: Batteries or AC Adapter(batteries are not included package)         Package Included:      1X Carbon Dioxide Meter    1X USB Cable    1X Charge Adapter (AC 100~240V 50/60Hz)    1X Small CD    1X English User Manual