Technasonic Check-GO Sweet Spot Finder Check-GO, a precision instrument for finding the sweet spot of a golf ball. It has been taken out of the box for photography and inspection, but it is a new, unused item. The marker pen and batteries have slightly deteriorated due to long-term storage. Please consider this only if you understand and agree to this. - Brand: Check-GO - Model Name: Sweet Spot Finder - Color: Silver/Black - Accessories: Instruction manual x2, marker pen, 2 batteries - Features: Device for finding the sweet spot Technasonic® T Check-GO ™ Sweet Spot Finder Advanced technology evolves your game! Have you ever made a beautiful 10-foot putt on a flat green, only to have the ball curve at the last moment and miss the hole? If you thought something was wrong with your equipment, you were more right than you expected. You may not believe it, but perfectly round golf balls have never been manufactured! Car tires look perfectly round, but they need to have their spin balance adjusted before driving at high speeds. The same can be said for golf balls. The unevenness inherent in all balls works against you, whether on the tee shot or on the green. Check-GO™ automatically adjusts the heaviest part along the equator of the ball, so the ball is less likely to wobble, rolls more accurately on the green, has fewer hooks and slices, and increases the distance of tee shots. Pros take advantage of every technological innovation. You can do the same! Just mark the sweet spot of each ball before you play. Enjoy more accurate shots, longer distances, and lower scores.