Measure the lift and or drag properties of wings, vehicle bodies, boat hulls and other shapes using this simple device. Attach the test item to the sensor rod and turn on the wind tunnel. The unit uses a USB cable (included) to interface with a computer. View, store, graph and compare test data. With modifications, this unit can be retrofitted to wind tunnels other than KELVIN® made. Includes Interface with USB Port, Windows compatible software, digital wind speed meter and USB cable. Grades 5 and up. Windows XP-7, USB.