Editing Vernier scale (section)

===Least count or vernier constant===
The difference between the value of one main scale division and the value of one vernier scale division is known as the least count of the vernier, also known as the vernier constant. Let the measure of the smallest main-scale reading, that is the distance between two consecutive graduations (also called its ''pitch'') be ''S'', and the distance between two consecutive vernier scale graduations be ''V'', such that the length of (''n''&nbsp;−&nbsp;1) main-scale divisions is equal to ''n'' vernier-scale divisions. Then

: the length of (''n'' − 1) main-scale divisions = the length of ''n'' vernier-scale division, or
: (''n'' − 1)''S'' = ''nV'', or
: ''nS'' − ''S'' = ''nV''. ''Least count'' ''(S-V) = S/n''