The Green Scope¿ Precision Optical Golfing Monocular. Are you facing a 150-155 yard approach shot to the 9th over water? Take the guesswork out of the distance to the pin with this adjustable monocular. It can estimate distances from 50 yards to over 200 yards. This lightweight, pocket size monocular gives you the distance in yards and meters. Features rubber eyecup, wrist strap and easy instructions. Measures 3-1/2" long. 10 year warranty.