2Axis 3 Axis Digital Read Out DRO is a display instrument that integrates the application and operation of the lathe, milling, grinding, boring machine, measuring machine, professional control machine. A digital readout (DRO) is a display unit which reads the signals generated by the linear encoder (or less frequently by rotary encoders) installed to several machine axes(2axis and 3 axis ,etc optional), used to display the position, speed and angle of workpiece (milling and the like) or tool (lathes and grinders)