Set of 4. Brand new. 35 strips in each container Keep your swimming pool clean and healthy with HTH Pool Care 6-Way Test Strips. These strips are perfect for testing the levels of alkalinity, bromine, pH, chlorine, CYA, and hardness in your pool water. Each strip kit includes two strips of each type, and is suitable for use in swimming pool. The HTH Pool Care 6-Way Test Strips are easy to use and provide accurate readings to ensure your pool water is safe for swimming. They are made in the United States and have an expiry date of 04/2025. Get your hands on these test strips and keep your pool clean and healthy all year long.