American Marine Inc. is proud to introduce PINPOINT Water Hardness Meter, the only truly accurate and affordable freshwater hardness measurement meter. The precise measurement of water hardness (inorganic salts) by electronic conductive means has long been considered to be the most accurate method to determine hardness. The display readings of the PINPOINT Water Hardness Meter are easily converted to several different measurement scales as to meet any user’s needs. Simple 3 minute set up and permanent probe. Satisfaction Guaranteed. The PINPOINT Water Hardness Meter and accessories fit perfectly into the PINPOINT Armor Hard Carry Case (also available on Amazon) for safe storage.