the first collimator had a defect (not calibrated). Since I was not satisfied, the seller contacted me and exchanged it. The second was perfect and looks like a great tool to get the job done. It is easy to check the accuracy of the collimator; Roll it on a flat table and watch the laser beam, make sure it doesn't go up or down, as long as the light is always in the same horizontal plane, that's perfect.
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