The Brunson 71-6010/ 564-10 Optical Tooling scale was made originally by K&E, then Cubic Precision, and now by the Brunson Instrument Company. Brunson kept the 71-6010 part number for a while, then changed it to the 564-10 and now it has some improved target markings and is the 564W-10. This is a 10" Optical Tooling Scale in excellent condition, with an accuracy of +/- .001 inch.