Mitutoyo 368-768 368 Series Holtest Three-Point Bore Gauge Inside Micrometers

The Holtest provides highly accurate three-point measurement of bore diameters
Measuring pins are spaced at 120° for increased accuracy of measurement compared to traditional two-point methods
By turning the ratchet the Holtest automaticall centres in the bore, which makes measurement fast and easy to perform without loss of precision.
98mm measuring depth without extension.