The appearance of this product is a thin strip, one end is arranged with the detection block according to the scientific distance, and the other end is a hand- position. One test strip of this product can simultaneously detect seven important Elements of the sample. After 1 minute, the total hardness, free residual chlorine, bromine, total chlorine, cyanuric acid, total , and ph of the sample water can be detected. How to use when testing: 1. Immerse the colored part of the test strip in water and take it out after 2 seconds. 2. Lay the test strip flat and wait for . 3. Compare the test strip with the color chart on the bottle body and complete the reading within to obtain accurate results. Comparison of test results: 1. Please use the color code card on the bottle to compare colors. 2. There are seven rows of color blocks on the color code card, which correspond to the seven test blocks on the test strip. Compare the test block with the color code card and read within to get accurate results. Note: 1. Do not put wet into the bottle. 2. Do not touc h or contaminate the test block on the test strip with your hands. 3. Tighten the bottle cap each time after removing the test strip. 4. Compare the color of the test strip under good light to get the best reading. 5. Store in cool, dry and dark conditions. 6. It is recommended to use up within 90 days after opening. Color: As Shown Material: Paper Package Contents: 100pcs Swimming pool test paper Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.