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I use this laser to collimate optics, or do other light experiments. The laser works perfectly. The lock works perfectly to prevent kids from turning the beam on. The beam is strong and narrow. The lens adjusts the scattering of the light. The device is strong metal construction. The only negative is that although the beam is narrow it does not end in an absolute point on the wall. You need to adjust the lens a bit or ad an additional lens or diaphragm to avoid the small reflections created around the point. This is something that can be fixed. At this price, you can't expect scientific built quality, so I am very satisfied!
Verified purchase: Yes | Condition: New
Great laser
Verified purchase: Yes | Condition: New