Features: You can quickly obtain chlorine, acidity， alkalinity and other indicators in a few seconds, water character in swimming pools, hot tubs or spas. Not more effort or guessing. These test papers are perfect for keeping pool water safe and healthy. You just need to immerse our water charactertest paper in the swimming pool, wait for a while, and then read the results. It is convenient and simple, very convenient. These water character test papers help you reach the best salinity grade in your pool. It can read your seawater grade clearly and accurately. Let you add or reduce brine accordingly and enjoy a wonderful pool experience. These water character test papers are made up of special materials, which can accurately measure the salinity of pool water. Sealed with water-resistant bottles or aluminum foil packaging to prevent moisture damage and keep the pool water clean and hygienic. These water character test papers can easily test your water character in minutes. It takes not expertise to get accurate test results, why is it so convenient. Specifications: Stuff: High-character filter paper, strong water resistance Process: Accuracy printing to assure accurate test results Package Includes: Packaging list information: Swimming pool salinity test paper (10 packs) × 1 Chinese and English instruction manual × 1 note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.