â·ÃÊͺ¶ÒÁÃÒ¤Ò à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì Carbon Dioxide CO2 Meter quality monitoring > à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì Indoor Air Quality CO2 Monitor CO220 à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì CO220 Desktop Indoor Air Quality CO2 Monitor Measures Carbon Dioxide (CO2), Air Temperature and Humidity Features: Measures Carbon Dioxide (CO2), Air Temperature and Humidity, plus calculates Dew Point and Wet Bulb Maintenance free NDIR (non-dispersive infrared) CO2 sensor Carbon Dioxide reading displayed in ppm with six facial icons indicating indoor quality levels Calculates Dew Point and Wet Bulb values Calculates statistical weighted averages of TWA (8 hour Time Weighted Average) and STEL (15 minute Short Term Exposure Limit) Automatic Baseline Calibration function Audible High/Low alarm Displays Year, Month, Day, and Time Manually store/recall 99 readings Complete with AC adaptor Specifications: Carbon Dioxide Range: 0 to 9,999ppm Carbon Dioxide Resolution: 1ppm Temperature Range: 14 to 140°F (-10 to 60°C Temperature Resolution: 0.1°F/°C Humidity Range: 0.1 to 99.9%RH Humidity Resolution: 0.1%RH Dew Point Range: -94 to 140°F (-70 to 60°C) Dew Point Resolution: 0.1°F/°C Wet Bulb Range: 14 to 140°F (-10 to 60°C) Wet Bulb Resolution: 0.1°F/°C Ips% Range: -1428 to 51 lps%* Ips% Resolution: 1% cfm/p Range: -30 to 1 cmf/p* cfm/p Resolution: 1 cfm/p Dimensions: 6.1 x 3.4 x 3.2" (155 x 87 x 81mm) Weight: 5.8oz (165g) *Ranges are calculated from 0 to 1000ppm CO220 Extech Hygrometer Temperature Thermo-Hygrometer à¤Ã×èͧÇÑ´ÍسËÀÙÁÔ ¤ÇÒÁª×é¹