There are a number of meters available from different sources. Some meters are more accurate than others, and individual companies quality control requirements should be considered when making a purchasing decision. Another important factor in obtaining optimum performance from ESD floor care products is maintaining an appropriate relative humidity level. This, however, is pushing the performance envelope far beyond what it is formulated for, and is definitely not recommended. To determine whether acceptable humidity levels are being maintained Perma advises conducting scheduled testing, particularly during the winter months, with a humidity meter.
Humidity meters are widely available from laboratory and instrument supply companies.