uxcell MS6252B Handheld Digital Anemometer Wind Speed Meter Air Tester USB MS6252B Multi-function Digital Anemometer, USB real time data uploading functions. With large screen LCD display and backlight, easy to read data in dark environment. Ideal for model plane pilots, shooters, hikers, and other outdoor enthusiasts. Measure air velocity in 6 units: m/s, km/h, ft/s, mil/h, ft/m, knots in one LCD display. Has the function of holding the reading data and displaying the maximum or minimum value.