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My Truncheon Meter gives varying readings! 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. There are several explanations for this:

Please ensure the plastic shroud is fitted to the probe. Also make sure the nutrient solution has been stirred, you can use the Truncheon Meter to facilitate this.
Allow for temperature equalization to take place. This can take up to 10 minutes especially if there is a major temperature difference between the Truncheon Meter and the solution being measured.