The present invention provides a shaft 3 extending in the present invention relates to digital loop steam meters, the length direction; Are formed longitudinally on the upper surface of the shaft 3, the shaft (3) Place on a front side of the green (G) to lift the shaft 3, a rear side, a golf ball (B) placed on top of the shaft guiding down along the (3) the shaft (3) rolling groove (5) sending roll up the green (G) through the discharge end 11 of the front end; And is installed on the shaft 3, the shaft (3) measurement for measuring a moving distance of the golf ball (B) between the rolls onto the green (G) from the emitter end 11 in accordance with lifting the rear side module (7); characterized by comprising a, and thus the green fast because it possible to measure more accurately and conveniently by the moving distance of a golf ball rolling stops the up green when measuring the digital distance measuring unit of the measuring module , green fast ground floor is possible to improve the efficiency of the measurement operation.