Anything it was not designed to measure.
hardly is something least helpful in measuring economic status of a country
Formica or laminate it is the least expensive.
Probably praying is the least effective form of birth control.
1 mm
A pitchfork.
o.1cm
Synchronous
A neglectful parenting style is least effective during adolescence.
0.5 micron is least count of cmm machine
correcting poor behavior in one on one meeting
by the least accurate measure
Least count is referred to as the smallest unit that can be measured by a measuring instrument. It is found by dividing the smallest division on the main scale by the total number of divisions on Vernier calipers.