Measure wet bulb and dew point temperature. Intuitive units automatically compensate for barometric pressure changes. They provide min. / max. / avg. on all measured and calculated readings. Audible and visual threshold alarms. Extensive discrete or continuous data-logging capacity—downloadable to your PC via USB interface. Both tools come with three AA batteries, user’s manual with safety information, calibration cap, hard carrying case, FlukeView® Forms software, power adaptor and international power plugs. Air Quality Meter With Velocity (No. 145437) includes an air velocity probe.