Normal
Nobody writes "9 dm"? Where are you from where people don't? At least in Sweden we use the whole spectrum regularly depending on the situation.And unless you note the number of significant figures I'd say you certainly fall into the trap of false precision with 90cm or 900mm. In your examples you specifically need mm precision, so using mm is appropriate.
Nobody writes "9 dm"? Where are you from where people don't? At least in Sweden we use the whole spectrum regularly depending on the situation.
And unless you note the number of significant figures I'd say you certainly fall into the trap of false precision with 90cm or 900mm. In your examples you specifically need mm precision, so using mm is appropriate.
