Hanna Instruments 4-Ring Platinum EC/TDS Probe

4-ring interchangeable platinum probe with built-in temperature sensor, ATC and 1 m (3.3ft) cable, for use with HI 3512, HI 2300 and HI 2550.
The potentiometric method eliminates polarization and thus is the most accurate way to measure electrical conductivity in liquids. The probe can also measure in a wider conductivity range because it does not suffer from electrolysis. Models with stainless steel and platinum rings are available. The platinum probes are ideal for high temperature applications, are easier to clean and provide more stable readings.