Digital flow meter without back run stop is designed for determining the amount of water passing through a plankton net or a pipe with a known diameter.

The flow meter is recommended for a horizontal tow of the plankton net. If lowered in a vertical position, the flow meter counts on its way down as well as when drawn back through the water column, thus causing an improper read-out. For a vertical pull you can use digital flow meter, which comes with the back-run stop feature. 

Diameter of propeller/counter body: 70/32 mm, length 185 mm, 5-digit counter; easy installation by a two-wire point connection of the nosepiece. The construction is based on a free flooding design, so it can be used for full (unlimited) oceanographic depth.  23.090 - Digital flow meter.  Mounting of the flow meter (the net bag to the right). Mounting of the flow meter (the net bag to the right).