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