Precision optical flats, complete set
One 3 inch diameter by 0.625 thk, Felt Polished to
Two 2 inch x 0.625 thk, FP to 1C, 2C
One 2 inch x 0.625 thk, FP to 3V, 3V (small chip in the corner)
Manufacturer: The Van Keuren Co.
Informational: the accuracy of optically flat surfaces is recorded in
millionth of an inch followed
by either "V" (Convex) or "C"
Example:3V = 0.000003 inch convex
All for $400