Features 1、Tests for free chlorine, bromine, pH, total alkalinity, total hardness and cyanuric acid. 2、Test at both ends of pool twice a week for be-st results. 3、Packed in a portable bottle, convenient for use and carry. 4、50 pcs per bottle for long time use. Specification With this bottle of PH paper, you can easily test the water quality of swimming pool or other places. Features: Tests for free chlorine, bromine, pH, total alkalinity, and total hardness . Test at both ends of pool twice a week for be-st results. Packed in a portable bottle, convenient for use and carry. A perfect hepler to easy understand your water quality in 5 main indicator. 50 pcs per bottle for long time use. Specifications: Quantity: 50pcs Item size (bottle): 100 * 45 * 45mm / 3.94 * 1.77 * 1.77in Item weight: 32g / 1.13ounce Package size: 110 * 50 * 50mm / 4.33 * 1.97 * 1.97in Package weight: 42g / 1.48ounce Packing List: 1 * Bottle of PH Paper Package List 1 * Bottle of PH Paper