How to Zero the Digital Readout on a Lathe Workpiece and use Diameter Function on Easson DRO Console

Operating Temperature 0’C 45’C (32’F 113’F). Item name LCD 3 axis Digital readout. SPEED (axial cutting speed display). Item name LCD 3 axis Digital readout. New Easson ES-12B 2axis / 3 axis DRO system mill lathe digital readout.