These pool test strips offer a safety guarantee for water quality and are widely used for testing free chlorine, bromine, total alkalinity, and pH. They provide quick and accurate results, are easy to use and read, and come in airtight bottles with 50 strips for 50 tests. Features 1. Safety Guarantee for Water Quality: The 3-in-1 test strip kit has been specially developed for hot tubs and hot tubs in the pool that can provide fast and reliable results to check the water quality. It can capture 3 elements in the swimming pool at the same time, such as free chlorine, bromine, total alkalinity and pH. 2. Widely Use: These test strips are often used in swimming pools, spas, bathrooms, hot tubs and other water chemical tests. It is a good helper to quickly and accurately capture the water quality. Research has shown that your swimming pool should be tested at least twice a week. With our test strip, you and your children can be surrounded by clean and harmless water. 3. Quick and Accurate: Test strips for swimming pools are made of high-quality fiber paper and a non-colored plastic cushion. After research and design by experienced experts, the test paper does not bleed out and the results can be obtained quickly and accurately. 4. Easy to Use and Read: Dip the test strips in the water and remove them after 1 second. Set it horizontally for 15 seconds and compare it with the color chart on the bottle. It is necessary to complete the measurement within 30 seconds to get accurate results of water quality. 5. Package Include: The airtight bottle is equipped with 50 test strips that can be carried out 50 tests on your water. After each test strip, the bottle cap should be tightened in time to prevent the test strip from being contaminated by water. Specification Material: Paper Color: White Size: 3.8 x 3.8 x 9.8 cm Weight: 36 g Package Include: 1 x Pool Test Strips Set ( 50 Pcs)