The distance moved by the tip of the screw for a rotation of one division on the head scale is called
Zero error
Zero correction
Pitch
Least count
Least count is the distance moved by the tip of the screw for a rotation of one division on the head scale.
For a screw gauge, the distance moved by the tip of the screw for a rotation of one division on the head scale is called
The distance moved by the tip of the screw for a rotation of one division on the head scale is called the pitch of the Screw Gauge.