A TDS meter (PPM pen, TDS stick) is convenient digital tool to instantly check your overall water quality..
Total Dissolved Solids (TDS) which is any salt, metal, mineral or other impurity in the water. This TDS Tester With the push of a button, shows overall water purity level, which will be shown 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 Tester is great for testing your tap water quality, or knowing when to change a filter. The TDS meter is a great tool for drinking water, water filtration and purification, hydroponics (test your nutrients), colloidal silver, aquariums, RO/DI systems, pools and spas, and more.
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