[6 in 1 Spa Test Strips]: This pool test strips is suitable for test waters total chlorine, free chlorine and bromine, pH, total alkalinity, cyanuric acid, and total hardness in water. [Why We Should Testing the Water?]: As we know, whether the chemicals in the water are balanced is very important for us. Poor water quality will affect our health. For example, Excessive chlorine content in the water quality can cause irritation to the human skin and mucous membranes, and cause skin diseases, keratitis and other diseases. [Easy to Use]: Our test strips test water quality quickly and accurately. First immerse the test paper in the water for 2 seconds, remove the test paper, and then wait for 15 seconds to get the result. Finally compare with the large waterproof color chart on the bottle. [Portable and Useful]: The hot tub test strips is small in size, light in weight, and easy to carry. The test paper can provide accurate and fast results for a variety of water sources, such as spas, swimming pools, hot tubs, freshwater and salt pools, etc. [Buy Safe]: We have been working hard to provide you with the highest quality products. If you're not satisfied with our pool ph test strips, please feel free to contact us. We provide full refund or free resend service.