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 7787 7787: 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 DIGITAL DESKTOP TYPE GIVES YOU A GREEN DAY! 15 DEGREE TILT ANGLE FOR EASY TO SEE AND READ REAL TIME CLOCK AND CALENDAR ARE DISPLAYED WARNING CARBON DIOXIDE LEVEL FROM 1000-5000PPM SUPER LARGE LCD DISPLAY CO2 VALUE, TEMP. , HUMIDITY, DATE AND TIME MAX. /MIN. RECALL FUNCTION TEMPERATURE UNIT IS SWITCHABLE NDIR (NON-DISPERSIVE INFRARED) WAVEGUIDE TECH. W/ ABC (AUTOMATIC BACKGROUND CALIBRATION) LONG TIME DRIFT COMPENSATION BRIGHT LED VISIBLE INDICATES POWER IS ON AUDIBLE ALARM WARNS CO2 AIR QUALITY IS POOR MONITORING RESIDENTIAL ,COMMERCIAL AND HOME AIR QUALITY CO2 ALARM OUTPUT DESIGN DRIVES RELAY TO CONTROL VENTILATION SYSTEM, SUCH AS FAN OR AIR CONDITIONER 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 7787