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The central hole
surrounds the required area, with a small pointer for
orientation. The long arms show the direction in which to
move, identified by N, S, E, W. Markers of 500 µm and 300
µm lengths are incorporated in the central ring. The inner
ring is 2 mm inside diameter, 4 mm outside diameter. The
grid is 16 mm across the legs.
Instructions included
with the Finder Grids indicate various attaching methods.
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