WATER PURITY TESTER will help you know! Now checking water purity is as simple as the stroke of a pen! Pour water into a clean glass and three seconds later you have an accurate reading on the LCD display. Test for bacteria, pathogenic viruses, cyanide, mercury, lead, toxins and ions. Pen-style Water Purity Tester is a necessary measuring tool for water both household and travels outside, and a good gift for friends and relatives as well. It is also available matching Houshold Water Filters,Household Water Purification Systems, Water Dispenser and Water Purifier. Our product is one and only in the world. It has been tested by JIM (USA) International CO. on the sensitivity of noxious metal compound and bacteria.The wholesale price is US$7.90 each FOB Shenzhen. Now our Water Purity Tester is very salable in Web Shops. Wholesalers and distributors are welcome.