Magnetic mount wind speed measuring device by Inspeed. Popular device for storm spotting and chasing. Many hundreds in use across the world. Includes digital display (Cateye Velo8 bicycle speedometer) and 25" of wire. Handles speeds over 125 mph. Attach it to your vehicle and watch the wind speed from inside - so you don"t have to go outside and get wet! For more information check out our web site (inspeed.com).