PS26 MKII CALIBRATION SLIDE FOR BRINELL HARDNESS TESTERS,, , SERIAL NUMBERED, SUPPLIED IN WOODEN CASE, , WITH UKAS (INTERNATIONALLY TRACEABLE) CERTIFICATE OF CALIBRATION, , , , PS26 MKII PATTERN DETAIL CIRCLES: (DIAMETER, MM?S) 5.0, 2.5, 1.0, 0.7, 0.3, , SCALES: HORIZONTAL & VERTICAL, 5MM IN 0.1MM DIVISIONS, , ACCURACY (OVERALL) ±0.0015MM, , , , PATTERN: PS26/UKA, , ORDER CODE: 05B01026/UKA, , MAKE: PYSER-SGI LIMITED