The Billings Optical Rule is a multi-task optical rule that has been jointly developed by John Billings FBDO, Eyeline Optical N.Z. Ltd and Aviva Mann Optical Group Australia.
It allows for the accurate measurement of spectacle frames, PD s, and other frame and fitting calculations required in today s modern optical practice, laboratory and workshop environments. Billings Rule unique features
Corners notched for resting on frame rim
Designed for both right and left-hand use
Protractor for measuring the pantoscopic angle
Coloured bridge centration grid for accurate frame alignment
Easy measurement for Box DBL sizing
Box PDR Rule
Quick check left and right BVD rule
Easily read figures and markings
Top pocket size
Sloping edges
Includes user guide
Measurements: 150(L) x 40(W) x 4(T) mm Product Reference: EYBILL