The ZeroWater TDS Meter is the quickest way to check the purity of your water. Designed to measure Total Dissolved Solids (TDS), this easy-to-use digital meter gives you instant insight into what’s really in your water, from minerals and salts to metals and other invisible contaminants.

It’s the same TDS meter included with every ZeroWater pitcher or dispenser and is a trusted tool for knowing when it’s time to change your filter. A reading of 006 ppm or higher indicates that your filter has reached the end of its lifespan and should be replaced for optimal performance.

Whether you’re using ZeroWater filters or simply curious about your tap water quality, this pocket-sized meter puts control in your hands.