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it measures the time taken by the waves to reflect and then calculates and re-transcribes the distance
It's versatile and can be perked up in a number of ways
find the right spot on the wall
stainless steel etc
on kitchen table
Self Training Tennis Helper Toys it measures the time takenFill the base with water and it instantly becomes heavy enough to hold the unit in place. Non skid pads underneath help keep it stable. Unwrap the cord, hit the ball as hard as you want, and the ball bounces back to you. The harder you hit the faster the ball is rebounded to you. Rubber cord is 15 feet long and stretches to 30 feet for hard hit balls. To shorten the rebound, wrap some of the cord around the base to your desired length A great device
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