SPI 3 points inside Micrometer, How to use a Holetest type to measure inside diameters

SPI 3 points inside Micrometer, How to use a Holetest type to measure inside diameters, this will show how to calibrate and use those internal type of micrometers, also, some things that they can do better than other methods. There will be a comparison with telescopic or snap gauges to see how those could compare with the precision of the micrometers. Thanks for watching and please feel free to like comment and subscribe... Pierre Beaudry [email protected]