A TDS meter looks like a thermometer from space. You dip it in water, and it gives you a number. Total Dissolved Solids—that’s what TDS means.
This device measures everything dissolved in your water. Minerals, salts, even mysterious gloop. It doesn’t tell you which minerals, just how much stuff is in there.
For hard water, anything above 120 ppm is worth noting. Above 200 ppm? Your water is basically a rock smoothie. Don’t drink the smoothie.
Funny fact: A TDS meter can cost as little as a fancy coffee. And it never complains about bad coffee—convenient.
