![SPI - 20 Inch Long, Accuracy Up to 0.0002 Inch, Spherical End Micrometer Calibration Standard - Use with Micrometers, Includes Heat Insulating Handle - Benchmark Tooling](http://benchmarktooling.com/cdn/shop/products/0640720-23_1024x1024.jpg?v=1591382477)
SPI - 20 Inch Long, Accuracy Up to 0.0002 Inch, Spherical End Micrometer Calibration Standard - Use with Micrometers, Includes Heat Insulating Handle
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