A Stimpmeter is the officially recognised and by the PGA Approved meter to determine the ball speed on golf greens. This is an V shaped rail made of aluminium. A pin on the top of the ramp keeps the golf ball rolling backwards, to the jig in an angle of approximately 20 degrees for green surface. So it has undergone backup, store, the ball always with the same speed the ride around 90 cm long track and be on the green. Now comes the distance from the end of the bar up to that point at which the the ball to fall asleep, and weight.