water tds meter Monitor TDS levels for: Drinking Water , Water filters , Hydroponics , Aquariums , Food & Coffee and so on water tds meterMonitor TDS ... levels for: Drinking Water , Water filters , Hydroponics ,Aquariums , Food & Coffee ,Pools & Spas , Colloidal SilverFeatures:Wide Range , Digital ... of Continuous Usage , 3 Year Limited Warranty ,Factory Calibrated TDS Meter