DT-802 : Desktop Indoor Air Quality CO2 Monitor CO2 Meter DT-802 Features: 1.Checks for Carbon Dioxide (CO2) concentrations with Max/Min value recall function 2.Maintenance free NDIR (non-dispersive infrared) CO2 sensor 3.Indoor Air Quality displayed in ppm with Good (380 to 420ppm), Normal (1000ppm) indication 4.Visible and Audible CO2 warning alarm 5.Displays Year, Month, Date, and Time 6.Automatic Baseline Calibration (minimum CO2 level over 7.5 days) or manual calibration in fresh air Specifications Function Range Resolution Accuracy CO2 0-9999ppm 1ppm ±75ppm(0-2000ppm)/±8%(2000-9999ppm) Temperature -10 to 60°C/ 14 to 140°F 0.1°C/°F ±1°C/1.8°F Humidity 0.1 to 99.9%RH 0.1%RH ±3%RH(25°C/30 to 99%RH) ±4%RH(25°C/0 to 30%RH) Set included : Paper box , Power Adapter (110-220V) , Meter , User Manual. *** NOT SUPPORT BATTERY *** CEM CO2 Meter DT-802 Hygrometer Temperature Thermo-Hygrometer ÇÑ´ËÅÒ¤èÒã¹à¤Ã×èͧà´ÕÂÇ à¤Ã×èͧÇÑ´ CO2 à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì à¤Ã×èͧÇÑ´¤Ø³ÀÒ¾ÍÒ¡ÒÈ à¤Ã×èͧÇÑ´ÍسËÀÙÁÔ ¤ÇÒÁª×é¹