When measuring soil, the conductivity value varies depending on the amount of soil in the sample, the amount of pure water, the stirring time, and the time for which the sample is left at rest. Be sure to carry out measurements using specified amounts under the same conditions. The following are precautions that should be observed during measurement:

<Precautions>
During measurement, keep the temperature of the supernatant solution constant.
Never submerge the conductivity cell in the soil sediment.

<Example of measurement>
Add 100 mL of pure water to 20 g of air-dried fine soil, and shake for 30 minutes. After shaking, measure the conductivity of the supernatant solution and obtain the corresponding value at 25°C by temperature-conversion of the result.