Touch probes and zero setters are proved to be effective CNC calibration tools and are capable of measuring with precision values of ±0.002mm. They are helpful in completing workpiece frameworks. They can be mechanical or magnetic types; they latch onto the spindle and signal contact closure by LED illumination. These probes and setters drastically decrease setup demands for manual and automatic tool changers, decreasing time needed during milling and turning operations by 50%. In order to achieve first-part accuracy during mass production runs, these machines are vital.