Turbidity is a measurement to indicate the presence of suspended particles: the more the particles, the higher will be the turbidity. Turbidity is the measure of the cloudiness of the water caused by impurities. Turbidity is the measure of the cloudiness of the water caused by impurities. The sediments that get settled at the bottom are usually clay, silt, fine organic, and inorganic matter, algae, and microscopic organisms, etc.An electronic meter is used to measure low turbidity level changes. Turbidity is measured in NTU (Nephelometric Turbidity Units.)