The shallow water sensor for depths of up to 100 m consists of a pre-amplifier covered by a titanium housing, a sensitive tip covered by a titanium protection cage and a SUBCONN BH4M connector (Microseries on request). This complete sensor has been developed for the external interfacing to CTD probe systems and can be used in towed vehicles or for fast depth profiling. An additional sensor for temperature and for conductivity may be required.The sensitive tip can also be used with electronics for other laboratory sensors (H2S, Ozone, Hydrogen and Hydrogen Peroxide) or for the CTD-Oxygen Underwater Probe.