within the arm 39 s volume of reach when the display shows a true 3 dimensional image the position of the calibration artifact in 3d space can also be correctly displayed further ensuring that the correct volume of measurement is measured these calibration features of a cmm can also be used in combination with the other features described herein and or can be used independently in other types of cmms for example in some embodiments the calibration process can utilize commands based on the position and motion of the cmm as discussed above in some embodiments during calibration holding the arm still for an extended period of time can indicate to the calibration software that the arm is in the desired position the software can then acknowledge its processing of this command with a change in display sound color etc this result can then be confirmed by the operator with a rapid motion of the arm out of said position the calibration software can then indicate a next calibration point or indicate that calibration is complete in addition this functionality can be extended to the operator as well one example is during the calibration of the probe the software can display the required articulation pose that the cmm should be in as well as the actual pose that it is in the operator can then move the cmm until it is in the correct position and record a.