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What are replaceable Contact Rings?

What is pH? | Why do I need to measure pH? | What do I use to measure pH? | What is conductivity? | Why do I need to measure conductivity? | What do I use to measure conductivity? | What is EC, what is CF, what is ppm, what is TDS, what is mS/cm and uS/cm? | What is a Bluelab Meter? | What is the Bluelab Truncheon� Meter? | What is the Bluelab pH Truncheon� Meter? | What is a Bluelab Monitor? | What are replaceable Contact Rings? | What are single and double junction pH probes? | What is a Bluelab Controller? | Why do we use Controllers? | Do any Bluelab products have data logging and PC comms links? | What are pH calibration solutions? | Which Calibration Solution do I use first when calibrating a Bluelab pH instrument? | Why do we need to clean the probes on Bluelab instruments? | What does IP65 mean? | My Truncheon Meter does not work! Why not? | My Truncheon Meter measures lower than expected! Why? | My Truncheon Meter measures higher than expected! Why? | Will low batteries cause my Truncheon to read inaccurately? | Can I use Alkaline Batteries in my Truncheon Meter? | My Truncheon Meter gives varying readings! Why? | Can I recalibrate my Truncheon Meter to my conductivity solution?

A. Contact rings are reference junctions. Contact rings extend the life of the pH probe of the pH Truncheon Meter. How? The Contact Ring protects the pH probe from contamination.