3 wire PD measuring, best ever?

A 3 wire PD measuring gizmo, that works without any calculations. All that is required is to know the nominal diameter of the thread and the pitch. Each pitch set has an addition to be added to the nominal diameter, all other calculations have been done before to give the add on.
Any further queries can be answered in the comments.
Copyright design by c.j.stephens 2019

Видео 3 wire PD measuring, best ever? канала Chris Stephens