Mitutoyo DRO Counter 2 Axis Digital Read Out. Please note photo is of another size. Bolt Hole Circle Calculation. Diameter Display and Tool Off Sets (parameter Mode). Memory compensation value. Selecting Coordinates 0 to 10. Detection reference (When connecting AT100 Series). Hold reference (When connecting AT100 Series). Touch Signal Probe Set and Hold (When connecting AT100 Series). Zero Approach Machining. Pitch Approach Machining.