Determine the average diameter of a grain of millet. What measuring instruments and accessories do you need for this?

Fold several seeds in a row, measure the length of the row and divide it by the number of seeds in the row. You will need a ruler. The length laid out along the line of millet is 30 mm.
The amount of millet is 15 pcs. a = 30/15 = 2 mm.

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