Light-Duty Contacting Conductivity / TDS Sensor with (ATC), Sensorex, Mfr#: CS150TC-K=0.1/CM1000$244.99+
Contacting Conductivity Sensor, 3/4" NPT, 10ft Cable, K=0.01, Sensorex, Mfr#: CS700/K=0.01/2/10$641.99+