Description: 【3 in 1 Design】: The test strips are designed to measure PH value, total alkalinity, and hardness all at once, satisfying multiple testing needs. 【Ideal for Water Testing】: These strips are great for testing the quality of water. They help maintain clean water and provide a better swimming environment. 【Easy to Use】: Simply immerse the test strip in water, no other operation steps required. It's a quick and convenient way to check your pool health. 【Accurate and Reliable Results】: The test strips can accurately measure the acidity or alkalinity of the water, helping you adjust the water quality promptly. 【Ample Quantity】: Each box contains 50 test strips, enough to meet your long term usage needs. The product is made of paper material with dimensions of 3.5*9.3cm of strip. Specification: Material: Paper Size Chart: 3.5cmx9.3cm/1.38inchx3.66inch Package Includes: 1 Box Test Strips(50pcs)(2 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.