Product details:

The Hitch that SAVES LIVES! trailer hitches are the only hitches on the planet with a built-in scale to measure tongue weight to ensure safe towing.Tongue weight should be no less than 10 percent and no more than 15 percent of gross trailer weight (GTW). Ensures Proper TowingPressure on the ball sends a reading to the built-in scale that measures tongue weight (lbs.) Age Group: adult.