Zero Error 2

for which instrument?

well zero error.........................when d instrument is doin nothing.....that is NOT measuring............then d first division may not coincide with d actual zero.....tht is it may not start with d ZERo.........that is it may not start from d starting................so this missin stuff is either subtracted or added...........THIS IS ZERO ERROR

The least positive +ve value of a zero error will be its least Count

taking example of vernier calliper..........
if zero of vernier scale does not coincide with zero of main scale when the 2 jaws and 2 edges(straight vale)touch each other ,then error called zero error.....

the least +ve zero error of an instrument is its least count ...

zero error is different from back lash error as zero error is a manufacturing defect and back lash error is an error in positioning caused by the reversal of travel direction.It is the error generally occuring in the appartus due to wear and tear caused by use in opposite directions.