SPI Electronic Caliper with Fractional Display Features Include... 0-6" / 150mm Measuring Range 0.0005" / 0.01mm / 1/128" Resolution Display: Inches / Metric / Fractions 1-19/32" Jaw Length Inch-Metric conversion SPC Output ZERO / ABS button allows display to be zero-set at any slider position along the scale. Includes Certificate of Calibration Furnished in fitted case