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Turbidity tube with built in Secchi Disk transparency cylinder with wood support 120cm
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Turbidity tube with built in Secchi Disk transparency cylinder with acrylic support 120cm
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Turbidity tube with built in Secchi Disk transparency cylinder with acrylic base support 120cm
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Gridded Sedgewick Rafter Counting Cell, S-R, Gridded. 0.0007" Line Width 1mm Grid.
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