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 CO250 à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì Indoor Air Quality CO2 Monitor CO250 CO250: Portable Indoor Air Quality CO2 Meter/Datalogger Measures Carbon Dioxide (CO2) , Temperature, Humidity, Dew Point, and Wet Bulb Features: Checks for Carbon Dioxide (CO2) concentrations Calculates statistical weighted averages of TWA (8 hour time weighted average) and STEL (15 minute short term exposure limit) Maintenance free NDIR (non-dispersive infrared) CO2 sensor Measurement ranges: User programmable audible alarm CO2: 0 to 5,000ppm Temperature: -14 to 140°F (-10 to 60°C) Humidity: 0.0 to 99.9% Backlit triple LCD display Built-in RS-232 interface for capturing readings on PC Data acquisition software and cable included to record and document CO2, Humidity and Temperature data Optional 33% and 75% RH calibration bottles Complete with software and cable, 4 AA batteries, and carrying case Carbon dioxide Meter CO2 Meter CO250 Extech Gas Detector Hygrometer Temperature Thermo-Hygrometer à¤Ã×èͧÇÑ´ CO2 à¤Ã×èͧÇÑ´¡êÒ«¤ÒÃìºÍ¹ä´ÍÍ¡ä«´ì à¤Ã×èͧÇÑ´¤Ø³ÀÒ¾ÍÒ¡ÒÈ à¤Ã×èͧÇÑ´ÍسËÀÙÁÔ ¤ÇÒÁª×é¹ à¤Ã×èͧÇÑ´á¡êÊ