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While "0.5 inch" or "0.01 meter" are probably more correct
than "0.5 inches" or 0.01 meters," the plural version is fairly
common is many English dialects.
My tech comm dept solved this long ago by always using the
abbreviations:
0.5 in. 0.01 m
LaVonna
LaVonna F. Funkhouser Immediate Past President, OK Chapter
lffunkhouser -at- halnet -dot- com Program Manager, 1995 Region 5 Conf.
technical writer Society for Technical Communication
COREStaff Communication Svcs.
My opinions do not officially represent anyone other than me.