à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì Carbon Dioxide CO2 Meter > à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì Indoor Air Quality CO2 Monitor CO200 CO200: Desktop Indoor Air Quality CO2 Monitor Measures Carbon Dioxide (C02), Air Temperature and Humidity Features: Checks for Carbon Dioxide (CO2) concentrations with Max/Min value recall function Maintenance free NDIR (non-dispersive infrared) CO2 sensor Indoor Air Quality displayed in ppm with Good (380 to 420ppm), Normal (1000ppm) indication Visible and Audible CO2 warning alarm with relay output for ventilation control Measurement ranges: CO2: 0 to 9,999ppm Temperature: -4 to 140°F (-10 to 60°C) Humidity: 0.1 to 99.9%RH Displays Year, Month, Date, and Time Automatic Baseline Calibration (minimum CO2 level over 7.5 days) or manual calibration in fresh air à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì Carbon Dioxide CO2 Meter > à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì Indoor Air Quality CO2 Monitor CO200