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The circles, squares, bars, and other geometries on the micrometer are designed to be used for calibration and verification of measurement systems. Table lists the individual characteristics of the eight test plates featured. Also features a 2.5" linear scale for larger scale calibrations or measurements, labeled every 0.5". Each plate is accurate to within ±2 micron of the stated dimension. Glass slide dimensions: 1" W x 3" L x 1.5mm T. Large circle at the right of the slide is 0.5" dia. Test Plates 1-4 correspond to top patterns and 5-8 to bottom patterns, all left to right. Patterns 1, 2 and 8 are calibrated on NIST certified version of micrometers.
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