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HM Digital TDS-EZ Water Quality TDS Tester
A TDS meter (aka PPM Pen, Nutrient Tester, TDS Stick) is an inexpensive and convenient digital tool that can instantly check your overall water quality. TDS = Total Dissolved Solids, which include any salt, metal, and minerals in the water. With the push of a button, the TDS-EZ can tell you your overall water purity level, which will be displayed on the screen in PPM (parts per million).
The lower the TDS level, the purer the water, with 0 ppm being pure H2O. The TDS-EZ is great for checking your tap water quality, or knowing when to change a filter. (The meter does not test for biological contaminants.) The TDS-EZ is a great tool for drinking water, water filtration/purification, hydroponics (test your nutrients), aquariums, RO/DI systems, pools and spas, and more.