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12 inch test flat For Sale

Price - $2,500.00

Ad Number: 175496

Posted: 28 Jun 2019

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One only 12 inch optical test flat. Quartz substrate. Made for a UK Government Research Establishment. Pristine condition with no marks or other defects. These were made to 1/20 wave, with high-reflectivity aluminium coating.

Diameter of aluminised surface is 295mm (11.6 inches), and overall diameter is 308mm (12.1 inches). Thickness 53mm (2.1 inches), and weight 8.7kg.

Will be sent in a custom-made attache case (see photo), and in a wooden box for security. The handle of the attache case is missing, but otherwise perfect.

Free delivery to mainland USA or Europe.

These cost $10,000 or more, so this is a remarkable bargain.


  • Condition Used, but as new
  • Location UK

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