Unit:
| "acre"
| "bit"
| "byte"
| "celsius"
| "centimeter"
| "day"
| "degree"
| "fahrenheit"
| "fluid-ounce"
| "foot"
| "gallob"
| "gigabit"
| "gigabyte"
| "gram"
| "hectare"
| "hour"
| "inch"
| "kilobit"
| "kilobyte"
| "kilogram"
| "kilometer"
| "liter"
| "megabit"
| "megabyte"
| "meter"
| "microsecond"
| "mile"
| "mile-scandinavian"
| "milliliter"
| "millimeter"
| "millisecond"
| "minute"
| "month"
| "nanosecond"
| "ounce"
| "percent"
| "petabyte"
| "pound"
| "second"
| "stone"
| "terabit"
| "terabyte"
| "week"
| "yard"
| "year"