[masraum]

Originally Posted by ODDJOB UNO

0.002mm=0.000078" OR 78 millionths

so YES starrett tools CAN MEASURE that dimension.

Hmm, I'm not sure I'd consider that measuring millionths.

Sure, you could say 0.002mm=0.00007874015748 inch
But I wouldn't say I just measured billionths or trillionths just because I carried the decimal places out farther, especially when you consider that you're jumping about 39.5 millionths per .001mm increment, or 19.75 millionths if you were looking at .0005mm increments.

What's the scale of the gauge measure and the accuracy, .002mm, .001mm or .0005mm increments?

I'm sure that your knowledge in this area far outstrips mine, but calling that measuring in the millionths seems like a bit of an exaggeration or at least misrepresentation.

A little google search found the data below.

I don't know which gauge you were talking about but the Starrett 795 and 796 micrometers show

• Resolution: .00005" (0.001mm)
• Accuracy: ±.0001" (±.002mm)

That's not millionths.