SD800: CO2/Humidity/Temperature Datalogger Records data on an SD card in Excel® format Monitor air quality in schools, office buildings, greenhouses, hospitals and anywhere that high levels of carbon dioxide are generated. Features: Checks for Carbon Dioxide (CO2) concentrations Maintenance free dual wavelength NDIR (non-dispersive infrared) CO2 sensor Triple LCD simultaneously displays CO2, Temperature and Relative Humidity Measurement ranges: CO2 - 0 to 4,000ppm; Temperature - 32 to 122°F (0 to 50°C); Humidity - 10 to 90%RH Datalogger stores readings on an SD card in Excel® format for easy transfer to a PC Selectable data sampling rate: 5, 10, 30, 60, 120, 300, 600 seconds or Auto Complete with six AAA batteries, 2G SD memory card, universal AC adaptor, and mounting bracket