Check the listing for details. Pro CFM Anemometer Measures Wind Speed Wind Flow Wind Temp for HVAC Air Flow USB. Condition: New – Open box. Listed at 49.99 USD. Brand BTMETER Material Polycarbonate (PC) Item dimensions L x W x H 3.35 x 6.42 x 1.38 inches Item Weight 2 Pounds UPC 754407495920 Manufacturer BTMETER Pro HVAC CFM Anemometer This anemometro can accurately measure Wind Speed in 5 units:m/s, km/h, ft/min, knots, mph; Wind temperature in /Celsius,Fahrenheit; Wind flow in CFM CMM. Allows you to record 600 groups of wind readings. 0.01 Resolution Wind SpeedometerWind Velocity range 0.03~100mph(+/- 3.0% + 0.2), Wind Temp Range 14F140F(+/- 2.7F) Wind flow range 0~9999 ft3/min. Capable of display Max/Min/Avg/ 2/3 Max of wind flow to let you know the peak of wind gust. And displays Max/Min of Wind velocity USB Connect to ComputerThis split type wind speed meter can connect to your PC via USB port (Win 7,XP,10), to monitor and record wind data, such as: speeds, temp, air volume, data, time. Perfect HVAC anemometer for CFM CMM measurement, CPU computer fans, air conditioner, air blower air velocity of dust pipe, tunnel,etc Easy to use1.69 x 2.36 large backlit display with beaufort scale indicator makes it easy to read, Low power indicator to remind you change the battery in time. Comes with portable case makes it easy to carry around. Auto Power OFFManual or Auto shut down after 5 mins without operation to save your battery. 9V battery included, 365 days warranty. Add to Cart, Buy it, Use it, for any quality problems, well replace you.