A multiple coordinate measuring system of the type wherein a probe explores some feature of a part being measured and acts through a transducer or similar device to record a measurement on a chart or other record. Both the part and probe are moved along coordinated and predetermined paths so that the probe remains a fixed distance from the surface of the part being measured when the theoretical dimension corresponds to the actual dimension of the part. Detected deviations of the probe from the fixed distance represent deviations of the actual dimension from the theoretical dimension and are recorded on charts or other records. In one embodiment of the invention of this application, the actual positions of both the part being measured and the probe during measurement are continuously detected and deviations of the part and measuring instrument from their theoretical positions are detected and employed to correct the detected signals from the probe indicating the deviation of the probe from the fixed distance.
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