Rahn black granite surface plate 30 x 60 x 8 in.

Subject: Rahn black granite surface plate 30 x 60 x 8 in.

Rahn Black Granite Surface Plate 30 x 60 x 8 in.
With 3 x 2 end ledges on stand
Last calibrated 4-28-00. Met Federal Spec. No. GGG-P-463
Overall flatness at last calibration .000400 in. Repeat measurements .000070 in.
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