The Mitutoyo 518-231 QM High Precision Absolute Digital Height Gage is a newly developed high accuracy and high resolution linear encoder. This gage makes it possible to measure inside and outside diameter via unique process (detect the circle apex and process by tracing measurement). Features include reference icon keys, SPC Output and RS-232C, a large LCD with back-light and a slider elevation knob/wheel. The GO/±NG judgment is performed by setting the upper and lower tolerances. If a judgment result is out of tolerance, the display back-lighting changes from green to red, so tolerance judgment can be made at a glance. This model has a measuring range of 0-14"/350mm.