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This Weigh Safe hitch ball has an easy-to-use, built-in scale that measures your trailer’s tongue weight every time you tow. If the scale indicates that your tongue weight is too low or too high, you can adjust it before you head out so that you can complete your journey with peace of mind, knowing that your setup is safe. And towing trailers with different coupler sizes is a breeze thanks to the magnetic, clamp-on 2-5/16″ ball adapter. Stainless steel construction resists rust and corrosion.