Kolmepunkti sisekruvik on isetsentreeriv ja isereguleeriv sisemine mõõtevahend, milles ülitäpselt töödeldud mõõtekoonus koos spetsiaalselt 3-mõõtekontakti tagamiseks paigutatud mõõteotsakutega kasutab mõõtmisel Abbe printsiipi.
Three-point internal micrometer is self-centring and selfaligning internal measuring instrument in which the high-precision tread machined into measuring cone, combined with the measurings bolts specially arranged to provide 3-line contact, make them only micrometers in the world that respect the ABBE pritsiple.
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