The CP11 handheld instrument is an economical multiple parameter meter that simultaneously measures and records CO2, humidity and temperature. Operating ranges: -20 to +60°C, 0.1 to 99.95% RH and 0-5,000ppm CO2, calculated Dew Point and Wet Bulb Temperature. 18,000 values with time stamp, automatic recording (%RH/°C/ppm), 99 single values with time stamp, manual recording, (%RH/°C/DP/Tw/ppm) 4 x AA batteries (50 Hours Life), or AC mains Power adapter. ...