本儀器主要用于各種圓柱形、球形、平行平面等精密零件的外形，內(nèi)孔尺寸的直接測(cè)量和比較測(cè)量，亦可進(jìn)行內(nèi)外螺紋中徑等特殊測(cè)量，是各級(jí)計(jì)量室中必備的基本長(zhǎng)度計(jì)量?jī)x器之一。Itisoneofthebasiclength-measuringinstrumentsformetrologicaldepartments.Itisapplicableforbothdirectandcomparativemeasurementsofouterandinnerdimensionsofworkpiecessuchasparallelplanes,spheres,cylindersandbores.Byusingvariousaccessories,itcanbeusedforspecialmeasurements,suchaspitchesofmalethreadsandfemalethreads.