Beam Watch is the first device to measure a laser without coming in contact with its beam which allows it to be the first laser quality measurement product in history to have no upper limit on the lasers which it can measure. Beam Watch provides high-power industrial laser users with data never before seen such as the dynamic measurement of focus shift caused by thermal effects on the laser system. Beam Watch also provides the industrial laser user with measurement of other key laser operating parameters in real-time.