Profiling Current Meter
The SeaGuardII DCP (Acoustic Doppler Current Profiler - ADCP) measures currents and can be extended with wave direction, oxygen, conductivity, turbidity, temperature, and serial sensors.
Oxygen Sensors
The Aanderaa Oxygen Optodes were the first to measure dissolved oxygen for years without drift - now it is even more stable! Below you can read more about the oxygen optode working principle