10-meter rod, 5-second interval, 3-kilogram sample...
What is the correct use of dots per inch, 300-dot-per-inch printer OR 300-dots-per-inch printer?
Assume that there is some reason not to use the abbreviation 'dpi'.
"dot" doesn't sound right to me. I would say "dots".
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Please explain the rule (if any) for using a singular form in '5-meter-per-second velocity' but a plural form in '300-dots-per-inch printer'.