CO2Meter.com Handheld CO2, Temperature, and Relative Humidity Meter (AZ Instruments 7755)

This lot includes one (1) CO2Meter.com branded portable CO2/Temperature/RH meter, manufactured by AZ Instruments (Model 7755). This handheld indoor air quality monitor simultaneously displays CO2 concentration, temperature, and relative humidity on a large triple-segment LCD with backlight. The unit uses NDIR (Non-Dispersive Infrared) waveguide technology for accurate and reliable CO2 measurement with a range of 0-9,999 ppm (2,001-9,999 ppm out of specified accuracy range) and 1 ppm resolution. Accuracy is +/-50 ppm +/-5% of reading from 0-2,000 ppm. Temperature measurement range is -10 to 60C (14-140F) with +/-0.6C accuracy. Relative humidity range is 0.1-99.9% RH. Additional calculated readings include dew point temperature (-20.0 to 59.9C) and wet bulb temperature (-5.0 to 59.9C). Features include programmable CO2 alarm threshold with audible alert (~80 dB), data hold function, max/min/average recording, 8-hour TWA (time-weighted average), and 15-minute STEL (short-term exposure limit) display. PC output via serial connection allows data transfer every 2 seconds for real-time analysis. Field calibration is supported in fresh air (380-420 ppm). The vented housing design promotes quick sensor response. Used condition from a commercial controlled environment agriculture (CEA) operation. Sold as-is. Recalibration recommended before use.