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Reply to "Laser distance meter for cal course layout?"

Two pulls are used. The tape is pulled and read. I put down the end and write down the reading. The I do a new pull, and a new reading, using a different scale.

If a nail should pull loose (which is unlikely) it will show up when the two readings are compared. I believe I'd feel it give when I pulled the tape. In any case, is it really likely that the nail would move just a little? It it was that loose it would simply pull out of the pavement. This I'd be sure to notice.

As for tension, pulling by feel is good enough.

Use of the two different scales makes this method robust. When using only one scale there is a tendency to repeat wrong readings.

I believe the solo method, as I've done it, fulfills the requirement for two independent measurements.

See the example below for actual data.

Solo Example
Last edited by peteriegel
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