The Perfectstroke Plane Laser is a golf putting training aid that provides feedback on stroke path direction and face angle relative to path. This product provides a straight red laser line that in a proper stroke should stay directly over the target line to indicate good path and face angle relative to path. The laser product is attached to the shaft near the grip and when the stroke path and face rotation are correct the laser line is projected on to the ground and will stay straight. If there is a problem with the path or face rotation it can easily be seen particularly when practicing with a baseline reference. It has an adjustable aperture direction so the laser line can be adjusted to any putter type or style. This is a great product to use in conjunction with the Perfectstroke 2021 Putting Aid or the Perfectstroke CrossLine laser.