SPI Electronic Internal 3-Point Micrometer Set Specifications include... 0.275" - 0.500" Measuring Range 0.00005" / 0.001mm Resolution 4.00" Extension Rod Included Includes 3 Setting Rings Features include... Self Centering 3 contacts points for accurate measurement of internal diameters. Measurement can be taken close to the bottom of a blond bore, can also be taken in a deep bore with extension rod. Inc./abs./inch/metric measuring Carbide tipped contact points. Supplied with setting ring and extension rod Protection level IP54 Ratchet thimble Includes Certificate of Calibration Furnished in fitted aluminum attache.
