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This plastic black-and-white secchi disk is 20 cm in diameter and the body includes lead weights. It has a 20-m nylon line that is calibrated every 0.5 m.
Use this clear, redesigned, 60-cm tube to accurately measure the turbidity of shallow or flowing bodies of water where a Secchi disk can’t be used. A single operator controls the water-level discharge from the tube by gently pushing it against the...