In a screw gauge zero of the head scale lies above the pitch scale axis, the zero error is:
depends on the thickness to be measured
When the plane surface of the screw and the opposite plane stud on the frame are brought into contact, if the zero of the head scale lies above the pitch scale axis, the zero error is negative.
It is found that for a screw gauge, the 5th division of the head scale coincides with the pitch scale axis and the zero of the head scale lie below the pitch scale axis. The least count of the screw gauge is 0.01 mm. What is the zero correction?