Mitutoyo Disc Micrometer w/ SPC Output Features include... 1-2" / 25-50mm Measuring Range 0.00005" / 0.001mm Resolution Diameter of measuring disk: 20mm / .787 0.7mm / .028 edge thickness to enter narrow recesses. With Ratchet Stop for constant force. With SPC output. Supplied in fitted plastic case. Functions include... Origin-set Zero-setting Data hold Data output inch/mm conversion Alarm: Low voltage