EC Meter
Inexpensive and convenient digital tool to instantly check overall water quality. Electrical conductivity is the waters ability to conduct electricity. The lower the EC level, the purer the water, with 0 µS being pure H2O.
This is a great tool for drinking water, water filtration & purification systems, hydroponics & gardening (test your nutrients), colloidal silver, aquariums, boilers & cooling towers, pools & spas, and more.