A device or application designed to determine the concentration of minerals, specifically calcium and magnesium, dissolved in water. The result, typically expressed in parts per million (ppm) or grains per gallon (gpg), indicates the water’s level of hardness. For example, a digital meter utilizes electrical conductivity measurements to estimate mineral content, displaying the result on a screen.
The evaluation of water hardness is crucial in various settings. It aids in optimizing the performance and lifespan of household appliances like water heaters and washing machines by predicting scale buildup. Furthermore, it informs decisions regarding the need for water softening systems, improving the efficiency of soaps and detergents and preventing mineral deposits on fixtures. Historically, determining water hardness involved complex titration methods performed in laboratories; these instruments provide a more accessible and rapid assessment.