Apera Instruments’ YD300 is designed for quick & accurate measurements of Water Hardness (the concentration of calcium ions Ca2+ and magnesium ions Mg2+). YD300 comes equipped with Aperas 601-S water hardness combination electrode that is proven to produce the same accuracy as the traditional EDTA Volumetric Method but in a much more convenient manner. Unlike the traditional EDTA Method, There is no need for probe stirring or adding reagents during tests, and you can directly measure your sample solutions’ ion concentration. The meter utilizes an intelligent chip design that supports automatic calibration, data storage (up to 99 groups) and a low battery voltage indicator. YD300 supports the ability to switch between eight commonly-used water hardness units, including mmol/L, mg/L (CaCO3), mg/L (CaO), mmol/L (Boiler), mg/L (Ca), ˚fH (France Degree), ˚dH (German Degree) and ˚eH (England Degree). YD300 is IP57 waterproof rated and comes as a complete kit, including YD300 meter, 601-S water hardness electrode, water hardness calibration solutions ( B1, B2 and B3 ), corresponding calibration bottles, water hardness activation solution, a 20 ml test cup, a test cup pedestal, 2 AA batteries, and a quick manual all in a rugged carrying case. Applications: drinking water, wastewater, cooling towers, boilers, pipelines, aquaculture, pools & spas, etc. The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.