The OptoSmart Laser Training Module is the laser module without the putter for players who want to practice with their own putters. The module can be mounted to most heel shaft right-hand putters with special adhesive provided in the package. It will not work on center shaft putters because the laser module has to be mounted on the center of the putter. The OptoSmart laser training putter aligns the sweet spot, the ball, and the target using a real, visible, and bright solid laser line on the putting surface.

You might think that you have a smooth putting stroke. You will never know until you get one of these laser modules from OptoSmart  for your putter. It allows you to see exactly where your putter head is facing through the whole back swing and follow through. It is a little scary at first. After a little while you get to see the line better, have a smoother stroke, and ultimately lower your scores. 

You can get more info at www.nsi-optosmart.com