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 - ABDO College

City Rule with instruction booklet


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

SKU: BK052. Categories: , . Tags: .