Features: Checks for Carbon Dioxide (CO2) concentrations Maintenance free NDIR (non-dispersive infrared) CO2 sensor Indoor Air Quality displayed in ppm with Good (0 to 800ppm), Normal (800 to 1200ppm), Poor (>1200ppm) indication User programmable Visible and Audible CO2 warning alarm Displays Year, Month, Date, and Time Max/Min CO2 value recall function Specifications: CO2: 0 to 9999ppm Temperature: 23 to 122°F Humidity: 0.1 to 90.0% Display: LCD with backlighting Sampling Interval: 2 seconds Overload Indication: "-OL-" Sensor Type CO2: NDIR (non-dispersive infrared) technology Operating Conditions: -5°C to 50 °C (23 oF to 122 oF) at < 90 % RH Storage Conditions: -5°C to 50 °C (23 oF to 122 oF) at < 90 % RH Power Supply: 110V-220V AC, output 6.0V DC ≥ 500mA (supplied) The CO100 is a desktop indoor air quality CO2 monitor that measures carbon dioxide concentrations (CO2) from 0 to 9,999ppm, air temperature and humidity. With user programmable visible and audible CO2 warning alarm. Meter has a maximum/minimum CO2 value recall function. Maintenance free NDIR (non-dispersive infrared) CO2 sensor. Complete with Universal AC adaptor.