Patent ID: 8001698

Claim:
A digital displacement measuring instrument, comprising: a main body; a spindle that has a screw screwed in the main body to be displaced in an axial direction; an encoder that detects a displacement of the spindle; a digital display unit; a display controller that converts the displacement of the spindle detected by the encoder either to a millimeter unit or to an inch unit and displays a converted displacement on the digital display unit; a sleeve that is fixed on the main body to receive the spindle therein; and a thimble that is fitted over the sleeve and is connected to the spindle, wherein a millimeter graduation that displays the displacement of the spindle by the millimeter unit and an inch graduation that displays the displacement of the spindle by the inch unit are axially provided on an outer circumference of the sleeve, an imaginary base line axially extending on the outer circumference of the sleeve is interposed between the millimeter graduation and the inch graduation, and at least one of the millimeter graduation and the inch graduation includes a plurality of major graduations and sub-graduations, the major graduations being provided with figures representing the displacement, and the sub-graduations equidistantly being disposed in plural between the major graduations and having lengths becoming gradually longer toward the major graduations, and a base mark that meets the imaginary base line when the thimble is rotated a whole number of times is provided on the outer circumference of the thimble.