*Low cost wall mountable monitor checking indoor air quality *Super large LCD displays CO2 ,temperature & humidity simultaneously *Designed with NDIR (non-dispersive infrared) waveguide technology CO2 sensor *ABC (automatic background calibration) preset on for long time drift compensation *Warning carbon dioxide level programmable *Visible & audible alarm (~80db) are both available *Alarm output drives built- in relay to control ventilation system *Max ,min, average functions included *PC output to computer for on line analysis *Display 8 hrs TWA value (time-weighted average) or 15 minutes STEL value (short-term exposure limit) *Housing design surrounds with rails to help air ventilation for quick and accurate response *Easy to manually calibrate at fresh air around 380-420ppm *Temperature unit is switchable *Measuring range:0~9999 ppm, (2001~9999 ppm out of scale range) *Temperature:-10~60 C (14~140 F) *Relative Humidity:0.1%~99.9%RH *DP(Dew point temp.):-20.0~59.9 C *WB(Wet bulb temp.):-5.0~59.9 C *Resolution:1ppm , 0.1 C/ F, 0.1%RH *Accuracy:+50ppm+5% of reading(0~2000ppm) *Other ranges are not specified *Temperature:+0.6 C/+0.9 F *Relative Humidity +3%RH o o (at 25 C, 10~90%RH) ; *Warm-up time 30 seconds *Meter size (LxWxH,mm):130x 85 x 60 *Weight:200g