Object is a ruler made of fiberglass or PCB material. Etched on the front face is "CARD SLOT LOCATOR". Etched on the reverse are two scales, one along each edge, with divisions every 1/4 inch. One scale is numbered from 1 to 16 at 1/2 inch intervals. The other is numbered 17 to 32.
Miscellaneous/tools and hardware
Gift of Lawrence Livermore National Laboratory (LLNL)