The Mitutoyo Digimatic Internal Micrometers have been one of the most commonly used three-point bore gages in the industry for over 15 years now. The easy to use electronics on the digimatic readout are simple enough for anyone to master in a matter of minutes. Each of the digimatic three-point internal micrometers has a ratchet stop which will provide better repeatability among operators. These internal micrometers are accurate with great repeatability and are highly recommended from Higher Precision.
A short video on the Mitutoyo 468-272 Digimatic Holtest Three-Point Micrometer: