City Rule with instruction booklet
£23.00
Designed by Campbell and Obstfeld
Distributed by Norville Autoflow
An optical ruler that enables the user to accurately measure the following:
- Boxed Centre
- Boxed Lens Size
- Conventional Inset
- Geometrical Centre of Segment
- Geometrical Inset
- Monocular Centration Distance (This is not a term or measurement defined in a British Standard)
- Fitting Height
- Segment Bottom Position
- Segment Depth
- Segment Diameter
- Segment Height
- Segment Size
- Segment Top Position
Supplied with instruction manual