Detailed list of measurement units accepted for each product category in EC3, see here. The following is a summary of the main units in their respective dimensions.
Dimensionality
Unit of Measure that EC3 will accept and understand
Unit
item, ea, pc, unit, piece, doz
Mass
g, kg, t, tonne,
lb, lbs, ton, short_ton, oz
Length
in, ft, yd, yds, inch, mil, mi,
inch, foot, feet, mile, miles,
km, m, cm, mm...