If the conductivity of the sample exceeds the range of the instrument, you may dilute the sample with distilled water. Be sure to perform the dilution according to the manufacturer's directions because the dilution might not have a simple linear relationship to the conductivity. Rinse the probe with distilled or deionized water and repeat the fourth step above with the next water sample until finished. Place a few drops of your sample liquid on the angled lens, and close the lid. Peer through the eyepiece.
Results appear along a scale within the eyepiece.
Record the measurement on your data sheet. Rinse the lens with a few drops of distilled water, and pat dry, being very careful to not scratch the lens' surface. Clean up and send off data. Volunteers should thoroughly clean all equipment and transport the samples to the designated lab, if necessary. Make sure that the data sheet is complete, legible, and accurate, and that it accounts for all samples.