External micrometer with disc anvils ⌀ 30 mm
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Disc anvil of hardened steel in flat version, without recess. Hardened and ground measuring spindle. Higher accuracy than DIN 863. Locking by clamping device. With ratchet and hand temperature protection. Clearly engraved black divisions and numerals.
For determining the tooth widths of spur and helical gears from module 0.8.