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Pi Tape Measure gives a quick direct single reading of average diameter with micrometer accuracy simply by placing tape around the periphery. It is used to measure round or out-of-round specimens of concrete, soils, and asphalt. The 0.10n (0.25mm) thick spring steel tape has graduations and numerals engraved and acid-etched on a ground surface. Vernier scale permits readings to .001in (.025mm) diameter; accuracy to ±0.001in, furnished with a certificate of calibration traceable to NIST.
Pi tape is Metric and reads from 50 to 300mm with a ±0.025mm accuracy.