"David Billington" wrote in message
...

Is the 2" point where you may have been holding it in your hand?. I have a
Mitutoyo scale and if I hold it long enough at one point then travel the
head across there then it will often flag an error, just leaving it for a
minute or 2 will sort the problem. I assume it's moisture from my hand on
the measuring surface cover.

No, 'cos I test them straight out of the box without touching the metal. The
2" mark is where the housing ends.