dusty wrote:What level of accuracy is reasonable to expect of a ruler or tape measure that is marked in increments of 1/16" or even 1/32".
1/16" = .0625"
1/32" = .03125"
If expecting measurement accuracy at the .005" level I hope you are not marking the cut point with a lead pencil.
That's a very good question, Dusty. Aside from very expensive rulers, I haven't found any with published accuracy specs. So you get what you get, and then you have to calibrate it yourself.
As for accuracy vs. resolution, it's real easy (assuming good near-field vision) to interpolate a measurement halfway between graduation marks. That would be the minimum acceptable accuracy to me. Interpolating to 1/4 of the smallest graduation isn't difficult either.
That said, I'm not a typical user. I have one eye that is very nearsighted, so without glasses it acts like a magnifying glass up close. I can easily see individual pixels on a 300 DPI printout -- those would be about 0.003" wide.