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This meter notify CO2 level, Air Temperature, Dew Point (DP), Wet Bulb Temperature (WB) and Humidity (RH) and is an ideal instrument for Indoor Air Quality (IAQ) diagnosis. Features: Backlight, Hold data, Min/Max Dual power source, battery (inlcuded) or 9V adaptor (**note: adaptor is not included on set). Power from battery is automatically cut off when 9V adaptor is in use Easy manual calibration on CO2 and humidity PC connection for on-line loggin and data analysis (not included on set) Manual calibration of CO2 and Humidity is available Auto / Manual power off Specifications: Measuring Range * CO2: 0~9999ppm (2001~9999 out of scale) * Temperature : -10~60°C (14~140°F) * Humidity : 0.1% ~ 99.9%RH * Dew Point : -20.0~59.9°C * Wet Bulb : -5.0~59.9°C * Temp : ±0.6°C / ±0.9°F Accuracy : * C02 : ±50ppm ±5% of reading (0~2000ppm) other ranges are not specified * Temp : ±0.6°C / ±0.9°F * Humidity : ±3%RH (at 25°C, 10~90% RH); ±5%RH (at 25°C, others) Response time * CO2 :