Water Quality Detection PenFEATURES TEST YOUR WATERHow Pure is Your Water? With the push of a button, the water tester can tell you your overall water purity. level, which will be displayed on the screen in ppm (parts per million) EASY TO USE AND ACCURATEJust stick it in about 1 inch of water instantly you get the reading. It's compact and doesn't need any maintenance. The water tester is a rugged model that includes a protective carrying case with a belt clip. AUTO OFF AND