AZ7752 carbon dioxide gas concentration detectorCarbon dioxide analyzerCO2 alarmAZ-7752 CO2 Meter Tester Handheld Analyser Temp RH Meter 9999 ppm- Low cost portable meter checking indoor air quality- Big LCD with CO2 &temperature display simultaneously- Designed with NDIR (non-dispersive infrared) waveguide technology CO2 sensor- Manual calibration is recommended- Warning carbon dioxide level programmable- Backlight function for working in dark place- Long time drift compensation- Audible alarm (~80db) threshold setting- Max ,min, average functions included- PC output every 2 seconds for on line analysis- Hold function freezes current readings- 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 calibrate at fresh air around 380-420ppmProduct specificationModel Number: 7752Carbon dioxide detection range0-2000ppm ,2001~9999ppm Resolution 1ppmAccuracy +50ppm+5% rdgTemperature range / accuracy-10~60 degrees C +0.6 degrees CHumidity range / accuracy 0.0~99.9% +3% (10~90%)Battery: 4 pcs x AA battery (NO include)Warm up time: 30 secondsStorage ambient temperature: -20~ 60 °CStorage environment humidity: 0~99% RH (water and gas can not be condensed)Operating temperature range: 0~ 50 °COperational humidity range: 0~95% RH (water gas can not be condensed)Meter size: 250 x 70 x 56m m (LxWxT)Packing: instrument, instruction manual, carrying case,