Micrometer accuracy vs resolution

[flew-da-coup]

So one of my technicans came to me with a Mitutoyo 0-1 micrometer ( not digital). The resolution of the micrometer is 0.001 inch. The stated accuracy from Mitutoyo is +/- 0.0002 inch. Does anyone know how in the hell Mitutoyo can claim an accuracy 5 times more accurate than the resolution? After researching there are other companies that do the same. Have any of you called on this and what was there BS excuse?

[LS_Larry]

There are several models look identical, one res = 0.001" the other 0.0001.  Model number 103-259 (.001), model 103-260 (.0001).  Perhaps you're looking at the wrong specs?

[scarface]

They do say its' .0002" without a vernier scale. Ask the engineer from Mitutoyo.

Current catalog says .0001" accuracy with .001 graduations.  Guess-u-mation theroy I guess.
NAVAIR AND 33K6- Procedures would degrade that to .001 or .0005. Half of the smallest division.
 
R. Francis