Carbon Dioxide Sensor Detector CO2 Temperature RH Wall Mount Desktop Data Logger with Backlight CO2 Measurement: Range (0~9999ppm) Accuracy [75ppm + 5% of rdg (C02) 0~2000ppm, others out of scale range] Logger mode : Key start/ stop, Immediately, Schedule, Real-time & Roll-over Temp. Measurement: Range [-10~50C (14~122F)] Resolution (0.1C/F) Accuracy [0.6C (-10~50C / -4~122F), others 1.2F] 32000 Data Logging Memory / Backlight Function / high CO2 concentration Alarm / Recall MAX & MIN reading / Calendar (YY/MM/DD) & Time (clock) / Super large LCD / (6) smiley icons indicate indoor air quality levels / Stable NDIR sensor for CO2 concentration / Made in Taiwan RH Measurement: Range (0.1% ~ 99.9%RH) Accuracy [5%RH (at 25C, 10~90%RH, others 7%RH)]