Red chinese laser focus

Recommendations for finding the proper focus on my red Chinese laser. Unit came with an acrylic spacer to adjust focus? How accurate can this be? Any other recommendations to be sure I at 100% focus?

I did the ramp test as described above, and then created my own acrylic focus tool with steps on each side of the focus point; e.g. 5mm focus point has a 3mm, 4mm, 5mm, 6mm, and 7mm stair step on it. I can decide whether I want to focus on/above/below the surface.

On the surface will give you the cleanest engravings. Just slightly below might be more beneficial for deep cutting, but could work against you for clean cuts. Start with on the surface and play with the others as you get more used to how it works.

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