The patented sensor measures a vertical turbidity profile through the water / sediment interface, and estimates the level of the bottom with sub-millimeter resolution. The latest generation, SM4, features nephelometric turbidimeters (calibrated in NTU and FNU), fluorescence meters, accelerometer, conditions-based monitoring, and UV anti-fouling. A new model, SM4P, is now offered for those who require the instrument for monitoring with custom installation, rather than using the anchor and holder solution.


The SediTrans contains the same nephelometric turbidimeter section as SediMeter SM4 (in fact, all the sensors minus the OBS array), but to this is added a magnetometer and a pressure sensor. By mounting this instrument with a float it becomes a combination turbidimeter + tilt current meter + tide level sensor + wave parameter sensor. It can also be used with a weight from a boat as a turbidimeter streamer with integral depth sensor. New for 2019, see our Blog for release video.

Nilsson sampler

To convert the turbidity data to suspended sediment concentration (SSC) one must take a sample of the latter. The Nilsson sampler is a light-weight (11 kg) sampler that nonetheless is useful in up to 200 cm/s stream velocity.


The SediLink is a radio modem using XBee® modules for communication to a shore station. The transparent dome contains the radio, the antenna, a solar panel, and 4 white LEDs that blink during communication. It is designed to be mounted on top of a 2″ rod buoy that can be deployed even by small crafts.