"REQUIRED TO MEASURE SQ INCH AREA OF 2ND STAGE NON-PAIR TURBINE VANE ASSY, 2ND STAGE WELDED CLUSTER TURBINE VANE ASSY, 2ND STAGE NON-WELDED CLUSTER TURBINE VANE ASSY WHEN USING COMPUTER ENHANCED METHOD;GAGE IS STEEL AND CARBIDE AND HAS INNER TRAILING EDGE AND OUTER LEADING EDGE BUTTRESS PLATFORM LOCATOR AND SUPPORTS, CONVEX AND CONCAVE AIR FOIL PROBES, PROBE ACTUATION LEVER, DIGITAL READOUT DEVICE;SERD 1587"