Ocular Micrometer


Also found in: Medical, Wikipedia.

Ocular Micrometer

 

a built-in micrometer in the eyepiece (ocular) of a microscope, geodetic instrument, or astronomical instrument. It is used for exact measurements of small linear and angular distances and for increasing the accuracy of sighting in theodolites. A filar micrometer is most often used as an ocular micrometer.

References in periodicals archive ?
After calibration variables like cellular diame- ter(CD) and nuclear diameter (ND) of the 25 cells in each smear were measured by using calibrated ocular micrometer fixed in eye piece of microscope on 40 x (Fig 1).
On higher magnification (40 X) the epithelial height was measured by ocular micrometer in three areas of same specimen and the average taken as the final measurement (Fig-2).
Measurements were done using an ocular micrometer in a stereoscopic microscope at a magnification of 15X.
Part 2 Basic Micrometry and Calibrating an Ocular Micrometer
We also constructed frequency diagrams of numbers of pregnant and postpartum females for each ocular micrometer line for each taxon.
Oocysts were measured using a calibrated ocular micrometer and are reported in micrometers as means, followed by the ranges in parentheses.
Diameter of the urethral lumen was measured using ocular micrometer (X22, MeCan Imaging, Japan) and stage micrometer (OH2, MeCan Imaging, Japan).
Beetle abdomens were macerated, and free sporophorous vesicles were examined under phase contrast microscopy at 400x magnification and measured with a calibrated ocular micrometer (n = 125).
Diameters of a subsample of spermatozeugmata (n = 25) were measured with a compound microscope and ocular micrometer.
Measurements were made using a calibrated ocular micrometer and are reported in micrometers as means, followed by the ranges in parenthesis.
Measurements (mm) were taken by using ocular micrometer whereas drawings of various body parts were made with the help of ocular grid.