Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
I used these lasers in my cross hair (I used two of them) project on my MechMate CNC Machine. They worked well and seem to be holding up fine. At $4 it's hard to beat the price. The wires seem to be long enough also.
I worry about the focusing lens coming loose or out of focus with vibration over a period of time. I guess you could use lock-tite to fix them into place if needed.
Worth the money, just be willing order ahead of your need as they take 2-3 weeks to arrive.
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