Meiji Techno, MA414, Filar Micrometer Eyepiece with Inclined Monocular HeadThe Filar eyepiece micrometer is a combination of a focusing eyepiece and reticle, but features a moveable line rule. The Filar micrometer avoids the necessity to estimate fractions of a division on a stage micrometer which may render inaccurate readings. The mobile line inside the micrometer is designed to cross the field of view, traversing a fixed scale, by means of a precision screw mechanism that is operated by rotating the external knob. In general measuring applications, a single line is aligned with one end of the specimen feature to be measured and a reading of the calibrated knob is noted.
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