https://hydrometproducts.kisters.eu/products/hardware/water-flow/ossb1-universal-current-meter
Universal water current meter | OSS B1 | KISTERS
Made from durable corrosion resistant stainless steel, the OSSB1 current velocity meter has a measuring range of 0.025m/s to 10 m/s for deep waters.
water current meteruniversalosskisters