This 3 in 1 ph meter is very useful. It measures the PH, EC and TDS.
It has a TDS meter for checking TDS/salt (NaCl) levels in freshwater aquariums, ponds and water purification systems.
Pocket Size TDS PH Meter is the ideal test kit for home and laboratory uses. Ideal use to test for water, pools, aquariums, spas, hydroponics, food, wine and beer making and more.