Laser guide

摘要

A laser guide for rotating tools comprises a first housing portion and a second housing portion. A seal is provided between the first housing portion and the second housing portion. A lens is located in the first housing portion or second housing portion. A seal is provided between the lens and the first housing portion. A method of testing a laser guide comprising applying a pressure to an internal chamber of the laser guide. Monitoring the laser guide for pressure gains or losses in the chamber.