A coordinate measuring auxiliary tool including a cylindrical shaped body that is attached to an outer circumference of a coordinate measuring probe, and a clamping mechanism for positioning and fixing the cylindrical shaped body to a tip of the probe. Measurement of a thin plate-shaped object to be measured can be easily and accurately performed with the coordinate measuring auxiliary tool having a simple construction and low price. At least a part of the cylindrical shaped body may be transparent, and a position of the cylindrical shaped body to the tip of the probe can be adjusted.
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