Pinpoint Conductivity Monitor™ is an instrument for the measurement of hardness in freshwater. The conversions are 33 µS=17.9 ppm=1dH. Good quality reverse osmosis water measures 5–15 µS, while de-ionized water measures 0–1 µS. The Conductivity Monitor is automatically temperature-compensated and has two ranges, making it useful for different applications.

The freshwater hobbyist will appreciate the instant readings for precise hardness. The saltwater hobbyist will use the Pinpoint Conductivity Monitor™ to assess the purity of deionized and reverse osmosis water.