A lightweight (Class 3) laser housed in a durable ABS plastic case that attaches to a player's putter face with adhesive tabs. The laser is activated by pressing a button when the player grips the putter.
The Laser Putting Alignment System is factory calibrated. Because it is physically mounted to the putter face you can be assured that the laser is pointing exactly where the putter is aimed. The thumb trigger is positioned so the player does not have to change his/her grip pressure to activate the laser. This will assure that the putter face doesn't rotate while the trigger is pressed.
The shape of the laser unit does not interfere with the optics between the putter and the ball. A "squared" putter face looks different when a golf ball is present than when one is not. Using the Laser Putting Alignment System simulates having a ball present, even when one is not. In addition, the wings of the laser unit (where the laser mounts to the putter face) act as guides to ensure center of percussion contact with the ball.
If you want to make sure you are square from 3 or 30 feet, there is no simpler, better-designed laser alignment device on the market.