most likely describes the size of the disc or carrier, not the metal sphere buried inside it. The sensing sphere is usually far smaller and marked separately in millimeters.
The cert number, that 213026B, is a traceability code. It ties the piece back to its calibration certificate, so a factory can prove the object was made and verified to a known standard. That’s what makes the testing auditable. Put all three together and there’s no ambiguity: this is a piece of quality-control kit, not a bonus ingredient. If you
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