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I have had good results with the following setup.

I glued a lithography photomask ( essentially a high quality flat front surface mirror ) to a similar sized block of wood. I drilled the wood block to take the mounting screw from a photo tripod.

On the tripod, I adjust the level in several ways that work.

1) use a small trysquare bubble level. level rotate 180 and see that it reads the same. Then do again in perpendicular direction.

2) a second way is to observe a plumb bob string beside the mirror. String and reflected string should be continuous not angled. Do from perpendicular sides.

I would guess that any mirror will do. Use whatever you can find around. At worst you can buy a quality mirror if it doesn't work.

Dave Fleming

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