Pneumatic comparator probes for engaging internal diameters of bores are provided herein. Pneumatic comparator probes include a probe body configured to contact a bore to be measured and a measuring component moveably connected to the probe body. The measuring component includes a port through which pressurized air passes when the pneumatic comparator is in use. The pneumatic comparator probes also include a variable separating mechanism moveably connected to the probe body, and movement of the variable separating mechanism adjusts a position of the measuring component in a direction of diametrical expansion relative to the probe body. Pneumatic comparator probe systems are also provided that are capable of holding and facilitating precise adjustment of the pneumatic comparator probes. Further provided are methods of measuring the bore size of a workpiece using the pneumatic comparator probe systems.

Pneumatic comparator probes for engaging internal diameters of bores are provided herein. Pneumatic comparator probes include a probe body configured to contact a bore to be measured and a measuring component moveably connected to the probe body. The measuring component includes a port through which pressurized air passes when the pneumatic comparator is in use. The pneumatic comparator probes also include a variable separating mechanism moveably connected to the probe body, and movement of the variable separating mechanism adjusts a position of the measuring component in a direction of diametrical expansion relative to the probe body. Pneumatic comparator probe systems are also provided that are capable of holding and facilitating precise adjustment of the pneumatic comparator probes. Further provided are methods of measuring the bore size of a workpiece using the pneumatic comparator probe systems.