Instantly measure water purity at home, in the office or on the road with the IntelliTec Digital Water Purity Tester. It is easy to use and works in seconds. Simply turn the unit on, insert the applicator tip into the water and push the read button. Accurately measures water purity and helps to avoid drinking water with harmful contaminants. Now it is no longer necessary to spend money on expensive bottled waters. The IntelliTec Digital Water Purity Tester is compact and lightweight. It fits anywhere a pen will...carry it anywhere! Also a great tool to maximize water filtration effectiveness. Use this tester to gauge when it"s time to change your filter OR whether or not you need a filtration system.