By means of spindle 1, measuring tip a, which contacts workpiece
b being inspected, displaces armature 2 mounted on flexible
flat spring 3. The clearances between armature 2 and the
coils of electromagnets 4 vary w ith the size of workpiece b.
This varies the inductance of the coils. The inductance is used
as a measure of the workpiece size.
$4360$SmE,M$