Ndt Iiw-Type 2 Inch Calibration Block Standard Usaf T.0.33b-1-1
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                                            ...International Welding Institute, ASTM E164 and U.S. Air Force NDI Manual T.O. 33B-1-1 Includes a 2.0" x-ray .250" deep cut overlay on 4.0" radius for distance calibration. Also Includes Numbers 3, 5 and 8 through holes (3/64", 5/64" E 8/64" diameter) for...                                         
                                            TMTeck Instrument Co., Ltd
                                         
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