EUTECH Model ECCON270043S With 4-Cell Cond. Probe CONSEN9201D K=0.530, Integral Electrode Holder & 100/240 Adapter, RS232 cable Cond/TDS/Salinity/Restivity and Tepm. Range 0 to 500ms/cm; 0 to 500ppt; 0 to 80 ppt,0 to 200mohms