I think it is called a "stimp" meter rather than a stint meter. Its a contraption that is a meter long and is raised a foot off the ground where the ball sits in a groove. The ball is released down the groove on a flat part of several greens around the course and the average distance in feet is the rating of the speed of the greens. Example, if on average it rolls 8 feet before stopping then the greens on that course at that time are rated 8 hence the expression "the greens are running 8 on the stimp meter". I am not totally sure of the dimensions (1 metre long etc) of this device but maybe some of the pros could clarify?