I need an explanation

one of the graduations of the fixed scale. The reading is thus 5.53 cm of )>. hill 14 Figures 1.13a and 1.13b show the scales of a micrometer screw gauge when the zero is being checked, and again when measuring the diameter of an object. What is the diameter? a) b) 0 10 45 0 45 0 5 A Figure 1.13