Unlike conventional pH paper, HAZMAT STIKS are designed for use by responder's in the field. The robust 150mm plastic sticks (6"x1"), made for handling with heavy gloves, have a large 25x25mm high visibility indicator surface, which allows clear reading even through masks.Conveniently packaged in an easily opened, resealable weatherproof cylinder containing 12 full range (pH 0-13) sticks and an easy-to-read indicator chart.