Special eyepiece which can be swapped with the existing one on a microscope. The graticule has some form of scale on it which allows the user to work out the size of the specimen they are viewing. It is important to remember to take into account the magnification of the objective lens you are using at the time.
Grat"i*cule (?), n. [F. See Graticulation.]
A design or draught which has been divided into squares, in order to reproduce it in other dimensions.
© Webster 1913.
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