This portable USB interface online logging CO2, Thermo-hygrometer is used to measure CO2 Concentration, Air Temperature and Relative Humidity with audible alarm. It is ideal for Indoor Air Quality ( IAQ ) diagnosis. This meter also measures Dew Point and Wet Bulb Temp. Features: ABC (Automatic Baseline Calibration) default and may disable Triple display, easy to understand and read CO2 High alarm threshold setting with audible beep Design with NDIR (Non-dispersive infrared technology) long life CO2 sensor Tripod receptacle for long time logging at the certain place All sensors are well calibrated before shipment Made in Taiwan Specifications: Parameter : Carbon Dioxide (CO2) Temperature Humidity Dew Point Wet Bulb Temp. CO2 Measure range : 0~9,999 ppm CO2 accuracy : ±75ppm + 5% of reading (0~2,000ppm),others unspecified Temperature Measurement: Range : 10.0~50.0°C (50.0~122.0°F) Accuracy : ±1.0°C / 2.0°F Relative Humidity (RH%) Measurement Range : 0.1~99.9%RH Accuracy : ±5% RH (at 25°C 10~90%RH), others ±7%RH Power Supply : 6 x AAA batteries (included in set) AC/DC adaptor (not included in set) Set Includes: 1 x Handheld CO2 Meter 1 x USB cable for Data transmission 1 x Online (Real-time) CD w/ Software 6 x AAA batteries English Operation Manual Black Carrying Pouch Standard Factory Packaging