I use architectural scales in 3", 1-1/2", 1", 3/4", 1/2", 3/8", 1/4", 3/16", 1/8", 3/32" of an inch, imperical rulers in 1/16", 1/32" and 1/64", a yard stick, engineering scales in 10, 20, 30, 40, 50, 60 divisions to the inch, a 30.5 centimeter ruler, and a meter stick. Then there are grids papers in 1", 1/2", 1/4", 1/5", 1/8" and 1/10", as well as common logarithm (base 10), the natural logarithm (base
e), and the binary logarithm (base 2) grids, and metric grids. I also have some 12-15 other rulers in measurements that are not so common, and a couple of speciality rulers that are "no to scale" to fit drawings that were "not to scale" either.
This does not address the travlers, calipers, micrometers, hammer, tongs, anvil, and etc. that a blacksmith uses for measuring.
IForgeIron > tricks > measuring has several ways to measure things. It is worth looking at if you have not read the material recently.
Working with a specific measurement is not a problem, but please, do not mix two or more units of measure on the same plan sheet or drawing.