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An OBS-3+ turbidity sensor housed in a 20793 stainless-steel case can only be submerged in fresh water at a maximum depth of 500 m. When ordered with the OBS-3+, the stainless-steel case is option -SB. The stainless-steel case is also available as a replacement part.

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Dimensions 16.51 x 3.18 x 3.18 cm (6.5 x 1.25 x 1.25 in.)
Weight 9.07 g (0.02 lb)

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