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My Truncheon Meter measures lower than expected! Why?

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 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 Meter to read inaccurately? | Can I use Alkaline batteries in my Truncheon Meter? | My Truncheon Meter gives varying readings! Why? | Can I recalibrate a Truncheon Meter to my conductivity solution?

A. Make sure the Truncheon Meter probe tip is clean. The use of a non scented liquid scourer is used as the cleaning medium to clean the probe face. Please follow the cleaning procedure as laid down in your instruction manual. Further instructions can be found on this website. Never touch the probe face after cleaning as this will cause probe contamination and lower the readings.

Allow time for the Truncheon Meter to adjust to the temperature of the standard conductivity solution being measured. A Truncheon Meter that is warmer than the conductivity solution will measure lower than expected. Allow up to approximately 10 minutes for temperature equalization to take place.

Always use a conductivity solution that is fresh and of known quality. The Bluelab CF27.7 conductivity solution is ideal. Always replace the cap on the conductivity solution straight after use. Dispose of any conductivity solution 2 months after first opening.