HM Digital COM-100 multimeter (conductivity)

Measuring the electrical conductivity would normally happen along with making a temperature measurement.

Once the temperature measurement has stabilised the conductivity reading will also have stabilised and can be recorded. Check that the unit is ‘µS’ and that it is above zero. River water will never have a conductivity of zero – if your meter is reading zero then it may be faulty or the probe is in air. This may be because you did not remove the cap, or perhaps the ‘Hold’ button did not register properly.

Ensure you have registered a result before discarding the sample. Temperature and conductivity readings should be made at the time of sampling.

When you have completed the temperature and conductivity readings turn the meter off, shake of any excess water and replace the cap.