The turbidity tube is a long thin clear plastic tube, sealed at one end with a white plastic disc with three black squiggly lines on it (seen when looking down the tube). The tube has a scale marked on the side. Measures 10-400 NTUs. With increments of 10, 15, 20, 30, 40, 50, 60, 80, 100, 150, 200, 300, 400 NTUs. Procedure: 1.
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