The YSI EXO 1 breaks the Sonde barrier in terms of quality reliability and affordability.
Log up to 90 Days on two D size Batteries.
Data Memory is 512 Mb and 1000000 readings .
Depth range of up to 250m.
Titanium wet-mateable connectors sensors include
pH or pH and ORP Optical DO Conductivity and Temperature,Turbidity, Nitrate, Ammonium and Chloride Ion selective electrodes