My Truncheon Meter measures higher than expected! Why?

A. There are several explanations for this:

Normally a contaminated probe face will cause the Truncheon Meter to measure low. The Truncheon Meter should be cleaned to remove any doubt and to avoid contamination of a conductivity solution. If you have any doubt about the conductivity solution, obtain a fresh one.

Allow time for the Truncheon Meter to adjust to the temperature of the standard conductivity solution being measured. When the Truncheon Meter is cooler than the conductivity solution being measured will measure higher than expected. Allow up to approximately 10 minutes for temperature equalisation to take place.

The calibration solution may have risen in conductivity or has been contaminated. Leaving the top off a calibration solution for longer than absolutely necessary will cause some of the liquid to evaporate allowing the conductivity of the solution to increase. A dirty Truncheon Meter probe may also introduce contaminants causing the conductivity value to rise. Always ensure your Truncheon Meter has been washed off with plenty of clean tap water and shaken dry before placing in a conductivity solution.