This is a Personal Water (TDS) Tester specifically designed for children, your adults and non-technical people.

The test results are simply displayed as an expression, this means if the water is not suitable to drink a "frowning face" will be displayed. If the weater is ok but not good a face with an "even expression" will be displayed. If the water is good a "smiling face" will be displayed.

The tester is designed to test the "Total Dissolved Solids" in the water.

It uses the electrical conductivity method and is accurate within 10%.