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Line M Up snaps onto your golf ball to allow you to easily and accurate add alignment and identification marks. Many different marking options allow you for a variety of uses. Use your marks to align your shot or tell if your putt is rolling straight. Line M Up also works great to add unique identifiers to you ball. The Line M Up Pro Ball Marker enables you to mark your straight line to the pin to sink more putts. Includes a Sharpie to mark your ball.
Snaps onto the ball to allow for accurate markings
Multiple different ball marking and alignment options
The ball marker enables you to mark your straight line to the pin to sink more putts
Includes Sharpie
Used as a playing aid as well as training aid

Greenkeepers Precision ball alignment tool (Line M UP Pro )