Vintage General Electric Standard Roughness Specimens #8651831G1

1944 GE Standard Roughness Specimens Cat 8651831G1 Wooden Case General Electric

Mitutoyo SJ-220 Surftest Portable Surface Roughness Tester 4MN 178-742-11 JP

Mitutoyo 178-742-13 Surftest SJ-220 (replaces SJ-210) Roughness Tester 4nm

Split Type Surface Roughness Meter with Detachable Drive Measurement Range 320μm

Digital Surface Roughness Tester with Detachable Drive Bluetooth Printing

General electric standard roughness specimens 8651831G2

Fowler-Rubert Electro-Formed Surface Roughness Comparison Standards Pocket Set