... to use 5. Delivery: 1day Portable water tester kit: TDS meter + water electrolyser A) TDS meter: TDS meter ... you can test the quality of various water in the following situations: water purification applications, wastewater regulation, aquaculture, ... pools & spas, ecology testing, boilers & cooling towers, food processing, physics & chemistry teaching, water treatment, cosmetics, wine, home, office, ...