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For shells, the positions of measurement for thicknesses are the valleys between ridges. Measurements are taken using precision point micrometers.
The widths of shells are determined as the external distances perpendicular to their ridges and between their “points.” Measurements are taken using precision digital calipers.
The lengths of shells are determined as the curvilinear distances running parallel to their ridges. Measurements are taken using either micro measuring wheels or strings and rulers.
To assure specified moisture, two batch samples are ground, weighed, heated in an air oven, placed in a desiccator and then re-weighed. Results are validated using two moisture validation machines.
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