Turbidity Tubes, Determine the degree of visibility when a Secchi disk can't be used, Each

Details

Clear polycarbonate tubes with a centimeter scale on one side and a Secchi disk design on the bottomSecchi design (4.5cm dia.) is screwed onto a stopper that removes for cleaningDrain with the drain hose and attached finger crimpIn two lengths for different turbidity requirementsLonger length meets requirements of The GLOBE Program&trade