Determine settleable matter in water and waste effluent and also measure the sand content in well water. The Thermo Scientific™ Nalgene™ Polycarbonate Imhoff Settling Cone is constructed from durable polycarbonate. The cone features a polypropylene screw closure. The provided leakproof† closure makes it possible to withdraw sediment for gravimetric anaylsis, and also aids in cleaning. Closure design enables user to read graduations to zero.