Material: PET Weight: 120g Variety: water test strip Test time: 60s Test items: total alkali ph hardness lead copper iron mercury chromium bromine nitrate nitrite residual chlorine fluorine sulfite Scope of application: Suitable for drinking water, aquariums, swimming pools and spas, industrial water, ponds, spa water Number of strips: 50 strips/can [Storage conditions and validity period]: 1 Storage conditions: Store in a dry place at 2C to 30C away from light (store at 2C to 8C). 2. Validity period of the product: Store in a dry place at 2C to 30C away from light, and the validity period is 24 months. 3. Validity period for opening the bottle: After opening, the cap of the cylinder should be sealed and stored in a dry place at 2C to 30C away from light. The validity period is 24 months. Sample requirements: 1. Take 5-10ml of the sample, and take the supernatant for testing after standing. 2. The test is carried out at room temperature around 25C. 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, and drain off the excess water on it. 2. After 1 minute, compare the reaction area of the test strip with the color of the colorimetric card to determine the test value of the solution to be tested. 3. The colorimetric time should be controlled at about 60s, if the time is too long or too short, the reading will be affected.