the answer to this was men
Hand geometry systems identify features of the hand, including shape, and lengths and widths of fingers.
So, the answer is Hand geometry.
Consistency and unity
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Because the measurement is relative to the unit. For example:
A measurement is six. But could be 6 inches, 6 yards, 6 nm, 6 feet, six as a quantity, six packages, six items, etc.
So until you specify the unit, that number means nothing.
Answer:
First blank: producer
Second blank: Hairdressers