While not a laser, the MS255SR features an integrated LED light that casts a shadow of the blade kerf directly onto the material. This is often more accurate than a laser because it shows the exact thickness of the blade—no calibration required.
The "L-Arm" is a rigid, extendable pole (usually about 3 feet long) with a camera mounted at a 90-degree angle on the end. It is designed to attach to a SeeSnake monitor or reel system. ridgid ms255sr