Hey, this is no good - μm to mm is three orders of magnitude, not one
There is no metric unit between micro (μ) and milli (m)
yocto (y), zepto (z), atto (a), femto (f), pico (p), nano (n),
micro (µ),
milli (m), centi (c), deci (d),
BASE, deka (da), hecto (h), kilo (k), mega (M), giga (G), tera (T), peta (P), exa (E), zetta (Z), yotta (Y)
Steve