ansi 9standards0 code issues - stating a range in notes

huangyhg

ansi stating a range in notes
which is preferred?
"temp range: -10ºf to 90ºf"
      or
"temp range: -10 to 90ºf"
i prefer to see the units on both numbers though i will admit, i ask myself the same question when i'm writing something similar in a report.
the first one is preferred with celcius in parenthesis after it. insert a space between the degree symbol and f for readability when reduced.