NTU 2
NTU 2 :
Nephelometric turbidity unit, a unit used in measuring water quality. An instrument called a nephelometer (from a Greek word meaning "cloudy") measures turbidity directly by comparing the amount of light transmitted straight through a water sample with the amount scattered at an angle of 900 to one side; the ratio determines the turbidity in NTU's. NTU measurements can be confused by the base color of the water from stains that may not create damage in the rock
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