DIY Laser levelling using webcam and laser level

[devmonkey]

I used straight edge clamped to the granite, just as you said.

Cheap webcam arrived, useless with lasers, sensor is smaller than the beam, will test it with wire when it gets here.

Sounds like your laser is no good, can you post a picture of it? Even my dewalt laser level produces a line narrower than the VGA sensor.