TiN-coated measuring contact points (over 6mm/0.275-inch range models) provide excellent durability
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Impact resistance and allow the instrument to measure to the bottom of a blind hole (up to 100mm/4-inch models)
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Highly durable because of carbide-tipped contact points (anvils up to 12mm/0.5-inch models)
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Measure deep holes using an extension rod (optional) which is available on models over the 6mm (0.275-inch) measuring range
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Setting rings for zero point adjustment is optional and?supplied in the fitted plastic case up to 100mm/4-inch. Over 100mm/4-inch supplied in wooden case.
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The Mitutoyo 368-164 Holtest Internal Micrometer has the following specifications: Range: 12-16mm Accuracy: +/- 2m Graduation: 0.005mm Measuring Method: 3-Point Contact Points: TiN Coated