The number of divisions on the head scale of a screw gauge of least count 0.01 mm with a pitch of 1.2 mm is 120.
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?