Simultaneously measures, logs, and displays temperature, humidity, CO2, and CO on a bright, backlit LCD display Wet bulb and dew point temperature % of outside air calculation CO2 and CO field calibratable Self-test function at startup Auto-backlight Automatically compensates for barometric pressure changes Min/Max/Average on all measured and calculated readings Multi-language user interface Metric or Standard units Audible and visual threshold alarms Extensive discrete or continuous data logging capacity, downloadable to PC via USB interface Keypad lock for security > Each Unit Includes (3) AA alkaline batteries Users manual (w/ safety information) Calibration cap Hard carrying case FlukeView Forms® software Power adapter International power plugs