Rahn 24 x 18 x 4 inch Precision Granite Surface Reference Plate

The Rahn Company, of Dayton Ohio, has specialized in making metrological granite reference plates and fixture plates for many years. This is a precision surface plate with a 1.5″ lip on either side. There are some chips along the edges but the surface area appears to be in great condition. This plate was last calibrated January 2010..