On: A brief introduction to interval arithmetic

[Zecc]

I'd rather see an interval written as (6.9, 7.1) than (6.916(6), 7.083(3))

[Joker_vD → Zecc]

You just take inch as the basic unit and then the interval is (83, 85). By the way, SI has so many multiplying/dividing prefixes so that you could pick the units that would make most of the numbers in your field integers.