circular protractor

A bevel protractor is a graduated circular protractor with one pivoted arm; used for measuring or marking off angles.

A single method to check the dwell is to remove the distributor cap and attach to the rotor a cheap plastic circular protractor (use blue tack or double sided sticky tape).

Useful for Tarquin Circular Protractors This is our response to many requests for a simple circular protractor which is smaller than the angle measurer and which could fit easily into a pocket or pencil case.