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we can find the zero error by closing the jaw of screw guage if the zero of main scale(MS) is concide with the zero of circular scale (CS) there is no zero error and if they are not concide there is a zero error in screw guage .
Undefined: You cannot divide by zero
Micrometer
There is no negative zero or positive zero, zero is just zero so you can take it off. For example: 3-2-0= just 3-2
Zero error is necessary for measuring instruments for measuring accurate results because it helps to check that the instrument which we are using is whether correct or wrong