PCE-VA 20-SET Multifunction Temperature Meter with Air Flow Hoods Combination anemometer-hygrometer-thermometer for HVAC system balancing. PCE-VA 20-SET is a multifunction temperature meter with air flow hoods for assessing and balancing heating, ventilation and air conditioning or cooling (HVAC) systems. In addition to measuring air temperature, this multipurpose handheld device measures dew point temperature, wet-bulb temperature, air flow velocity (i.e., wind speed), volume flow and relative humidity (RH). This combination anemometer-hygrometer-thermometer features a 10 cm / 3.9" Ø fan impeller, easy-to-read backlit LCD, and functions such as display hold, average value, maximum value, minimum value, battery-saving automatic power off, low-battery indicator, and metric or imperial unit selection.