Buy settling testers accessories from Grainger. Imhoff cones measure the volume of settled water and sewage. The glass-clear, shatter-proof styrene acrylonitrine cone handles graduations up to 1000 ml for samples with a high volume of settled matter. Contain them in a 3-place rack for Imhoff Cones. They are constructed of plated, heavy-gauge steel to provide lasting durability. Floc test the efficiency of flocculation or precipitation agents.