"Nate Perkins" wrote in message
. 125.201...
Yeah, my point exactly. Most people have no concept how small 0.0002"
really is.

True


You can't see 0.0002" with your eye.

Yes, you can, easily.

You can't reliably see it
with the best optical microscopes. It's so small that any amount of
routine handling will throw it out of tolerance.

Depends upon your routine.

So why pay extra for 0.0002" tolerance in Starrett vs 0.002" tolerance
from
Lee Valley? Beats me.

Depends on the intended purpose.