Moisture protection, and fast, reliable results make the Insta-Test an unbeatable system for water quality testing. Simply dip polystyrene strips into water sample, and Compare the resulting color pad change to color Chart. Monitor water quality contaminants with quick spot tests convenient, on-site water testing with bright easy-to-read colors. Pop-top vial with desiccant liner protects strips from moisture 25 strips per vial.