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630
100 markings, divisions 0.01mm on disc
Calibration ruler on 1/8" (3.2mm) nickel-plated copper disc. 1mm long scale with 100 markings, with 0.01mm divisions with an accuracy of +/- 0.0005mm or better. Available unmounted, or mounted on SEM mounts.
PELCO® Technical Notes, SEM Low Magnification Ruler Disc (275KB PDF)