Take the guesswork out of your water quality with the Third Wave Water TDS Meter. Designed for coffee lovers who mix their own mineral blends, this handy tool helps ensure you're starting with truly "empty" water—like distilled or reverse osmosis—as recommended for optimal brewing results.

TDS stands for Total Dissolved Solids, indicating the concentration of minerals or particles in your water. While it doesn't identify which minerals are present, it does tell you how much is in there—perfect for:

• Verifying if your base water is mineral-free before adding Third Wave Water.
• Testing tap or filtered water to see if it's suitable for brewing.
• Monitoring water consistency over time for repeatable coffee quality.

The cap doubles as a sample cup—just fill it with water, insert the meter, and test. Compact, reliable, and easy to use, this is a must-have tool for anyone serious about water and coffee.