The first collimator I received, the laser would not come to a point on the target grid and the lid on the storage case was defective (would not close). The replacement collimator I received also came in a defective storage case with a broken lid. The second collimator, after following the directions and how-to videos step by step, would not accurately collimate my sct. I “collimated” my sct with the Hotech collimator and tried to start the collimation process over and reproduce the results. The laser point should hit the target in the same spot, but every time I placed the collimator in the sct and lined it up properly, the laser would be in a different spot on the grid. Unusable.