Simultaneously measures and data log multiple parameters such as: CO, CO2, Temperature, Relative Humidity, to monitor indoor air quality conditions. Calculates Dew Point, Web Bulb Temperature, Absolute Humidity, Humidity Ratio and % Outside Air. Built-in memory allows user to store multiple point measurements. o Equipped with RS232C terminal. Easy user calibration with built-in calibration function. Capable to continuously monitor parameters via PC. Large LCD shows multiple parameters at a glance. Calculates dew point, wet bulb temperature, absolute humidity and humidity ratio.