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The unit of turbidity is typically measured in: 1. Nephelometric Turbidity Units (NTU) 2. Formazin Nephelometric Units (FNU) 3. Jackson Turbidity Units (JTU) 4. Siemen's Turbidity Units (STU) NTU is the most commonly used unit, and it's defined as the amount of light scattered by a sample at a 90-degree angle to the incident light beam. In water quality monitoring, turbidity is often measured in NTU, with the following ranges indicating different levels of water clarity: - 0-5 NTU: Very clear water - 5-20 NTU: Clear water - 20-50 NTU: Slightly turbid water - 50-100 NTU: Turbid water - 100+ NTU: Very turbid water Turbidity can also be expressed in other units.