(GregS) writes:

In article , Sam Goldwasser wrote:
"Rheilly Phoull" writes:

D. Whyte wrote:
In an inexpensive leveling laser for home use, (such as the Lazerpro)
how is the line or cross produced?

I think they are using coherent light from the laser through a mask.

Not quite a mask but probably a holographic optical element.

I have a cheap Harbor Freight line beam. It looks like a refraction
grid that makes the line. looks like IIIIIIIIII to make a horizontal
beam.

Yep, that's another way, so perhaps that could be called a mask.
That's probably even cheaper than the HOE, but quite effective.

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