Feature 1.100% brand new and high quality 2.Suitable for Pool Water Testing 3.[Storage conditions and validity period]: 1 Storage conditions: Store in a dry place at 230 and protected from light (28 is better). 2 Product expiration date: Store in a dry place away from light at 230, and the validity period is 24 months. 3 Validity period for opening the bottle: After opening, the cylinder cover should be sealed and stored in a dry place at 230 and protected from light. The validity period is 6 months. Testing method: 1. Immerse the reaction area of the test strip in the solution to be tested for 1-2 seconds, take out the test strip, draw the edge of the test strip along the wall of the solution container, and remove the excess water on it. 2. After 1 minute, compare the color of the reaction zone of the test strip with the color of the color chart to determine the test value of the solution to be tested. 3. The color comparison time is best controlled at 60s, too long or too short will affect the reading. Precautions: 1. When removing the test paper, do not touch the reaction end of the test paper, so as not to contaminate the test paper and affect the test results. 2. After taking out the required number of test papers, keep the remaining test papers sealed and protected from light. 3. Try to keep the liquid to be tested as colorless or light-colored. Before testing the liquid with too dark color, it can be dehydrated with activated carbon adsorption. If the liquid to be tested is relatively turbid, let it stand for a period of time, and take the clear part for testing after it settles. 1.materialPET 2.colorAs the pictures shown 3.sizeas the picture shows Package include:100pcs Note: Please allow minor error due to manual measurement. The colors may be a little difference for the different monitor display.