Description
Compass for vertical measurement with angle fixer. The compass of Spirgi Nally 30 is very useful since it has the main advantage that it always uses the same references, it has one arm that rests at the base of the nose and another arm that rests at the base of the chin. Since the references are always the same, the DVo that is registered in the first appointment will be used for the other appointments, so it will not be necessary to repeat the measurement at the beginning of each appointment.
measuring