If they really need to be that precise, perhaps they should be using only the standard SI units. They should have asked about micrometers (µm). "Micron (µ)" h

If they really need to be that precise, perhaps they should be using only the standard SI units. They should have asked about micrometers (µm). "Micron (µ)" has been deprecated since 1935, and was revoked entirely in 1967. US schools typically do not teach the archaic or old-fashioned terms, as they won't be on the standardized tests. It would be similar to a US company going to Germany and looking for people that knew what a "mil" was. (It's 0.001 inch.)