Sprite Pocket Digital TDS Meter
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Model WP-2000, measures TDS (totally dissolved solids, in parts per million), a major indicator of water purity. Some are positively charged ions: Fe++, Cu++, Pb++, Ca++, Na+, Mg++, Ra++, Ba++. Some are negatively charged ions: OH-, CO3-, Cl-, HCO3-, SO4--, HSiO3-. TDS monitor measures electrical conductivity due to all these current carrying ions. Higher the TDS reading, dirtier the water. Sprite TDS monitor WP-2000 model is easy to operate, 200 plus hours on a battery. Size: 5.5" x 1.2" x 0.8", weight: 3.2 ounces, rugged, accurate, LCD digital readout. Change the RO membrane when the TDS value is high, say 200 or more.