The CO2512 monitors Carbon dioxide, temperature and relative humidity levels quality of air in your home, office or indoor greenhouse with pinpoint accuracy. It's designed to be durable and last for many years with extremely user friendly features. Temperature Ambient Temperature Humidity Relative Humidity CO2 The CO2 Concentration USB interface PC Software Included Connect to PC computer Device via USB cable Adapter to connect PC computer. Easily & quickly update Software for latest features DataLogger Graphing tabular data Data can be stored in the meter or directly saved on a computer through PC interface. Recorded data can be further processed by PC computer. Detail information for each data set (start data, start time, recording rate and record numbers). Internal CO2 Alarm Buzzer When the measuring values go beyond alarm point, the symbol will blink on the LCD. The beeper will make “ beep-beep-beep ” sound. Here are some of the main features of the CO2512: Carbon Dioxide (CO2), Range 0～30,000 ppm Accuracy ±75 ppm + 3% of reading Temperature, Range - 0 ~ 50°C (32 ~ 122°F) Humidity, Range 0.1 ~ 99.9% PC Software control Sampling interval: 20 sec Logging Memory on device Up to 32,000 sets Power Supply 9V DC Battery User operated CO2 calibration / Made in Taiwan / ENVIRONMENT CONDITIONS Altitude up to 2000 meters Relative humidity: 90% max Operation ambient temperature: 0°C to 50°C UNIQUE FEATURES New Experience CO2, humidity and temperature sensorsDual wavelength NDIR CO2 sensor (Non-Dispersive Infrared) for superior stabilityUser operated CO2 calibrationData Hold & Max/Min/STEL/TWA functionAdjustable auto power off timerInternal CO2 alarm buzzerDatalogging up to 32,000 setsUSB interface, PC software includedBacklight display function SYMBOL DEFINITION & BUTTON LOCATION 1） CO2 Sensor 7） REC Button 2） Display Screen 8） °C/°F Button 3） Power and Back Light Button 9） Calibration inlet 4） MAX MIN AVG Button 10）USB Interface 5） SETUP Button 11）Tilt Stand 6） DATA HOLD Button 12）Battery Compartment