On Thursday, March 7, 2019 at 12:17:36 PM UTC-5, wrote:

We don't know yet if the laser measure will work. Whether its utility
is destroyed or not. In fact, it seems to be working so far. I'm glad
he is posting his experiments.

Eric:

I am writing from the perspective of one who must rely on accurate measurements for revenue, and whose instruments are calibrated to this end.

For the purposes of a hobby - that is an entirely different matter.

Peter Wieck
Melrose Park, PA