Templat:Convert/by/AonSoff
< Templat:Convert | by
1 4⁄5 by 3 6⁄7 {{{u}}}
The Templat:Convert/by/AonSoff formats a range where the 2 amounts are separated with word "by" between the numbers. The range can text-wrap at "by" if the first amount > 4 long, such as a number in scientific x10 notation.
For unit-codes where the unit symbol is undefined (or blank), then the template also checks for literal "{{{u}}}" with leading curly brace "{" and then the unit name (depending on amount singular or plural) will be displayed instead.