raised to 20 degrees of aluminum angle

the 18-hole green speed consistency, invented a measuring instrument used to measure green speed, in fact, very simple to do a metal ramp is definitely low-tech! is an aluminum plate, 36 inches long, with a V-shaped groove, the flat slope on the greens, the measurement will be raised to 20 degrees of aluminum angle, then ball on the top of the slope, generally to ensure that the ball rolled down from the top to reach the bottom at a speed of 6ft / S, and then watch how far to scroll (in units of Feet), with the rolling distance to identify the speed of the greens. For example, rolling a 10Feet, green speed is stimp speed 10. This approach has continued to the present, so the measuring instrument is called the green Stimpmeter) indicates the speed of the greens is stimp rating or call stimp, now Sidi spectral index is also used to compare different greens speed.