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Specifications
- Description:NBS 5 Bar Test Ref 1963A BS 4657
- Cat. no.:102096-178
- Supplier No.:68098-11
Specifications
About this item
A series of gratings diminishing in size as they go towards the central target. Lines range from 3 lines per mm to 20 lines per mm. Supplied as a positive high contrast chrome image on glass substrate 50 x 50 mm.
- 3-30 Lines per mm Chrome surface image B270 Glass 50 mm x 50 mm
Also available in low contrast and negative form.