For the screw gauge shown below, the least count is 0.01 mm. What is the zero correction?
+ 0.95 mm
As the zero of the head scale lies above the pitch scale axis, the zero error is negative.
Zero Error = – (100 – 5) × L.C = – 95 × 0.01 mm = – 0.95 mm
Hence, Zero Correction = + 0.95 mm