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Electron Microscopy Sciences Thompson Graticle G23, 21mm

Supplier: Electron Microscopy Sciences 6809021

For counting particles in any of three areas of known size. The graticule is calibrated in the same manner as a normal eyepiece scale. The result is then used to calculate the area of any square.
Size: 21mm
Divisions: 10 mm, 7 mm and 4 mm squares
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