Name: Aquarium Test Strips. Material: PVC. Size: Tube: 13.5x1.5cm, Bottle: 12.5x5cm. Storage condition: 2℃~30℃ dry place and keep away from light (2℃~8℃ is good). Shelf life of the product is 12 months, after opening, please tighten the lid at any time, the best results within 3 months. Sample requirements: 1. Sample 5-10ml of the liquid to be tested, take the supernatant after standing to do the test. 2. The test is best conducted at room temperature around 25℃. Test Method: 1. Immerse the reaction area of the test strip into the solution to be tested for 1-2 seconds, take out the test strip, and put it on paper to drain off the excess water on it. 2. After 30 seconds, compare the reaction area of the test strip with the color on the color scale to determine the test value of the solution to be tested. 3. The colorimetric time should be controlled within 60s, too long or too short time will affect the accuracy. Note: 1. Do not touch the reaction end of the test paper when removing the test paper to avoid contamination of the test paper and affecting the test results. 2. After removing the required number of test strips, seal the remaining test strips and store them away from light. 3. Keep the liquid to be tested colorless or light-colored as much as possible, if the color is too dark, use activated carbon adsorption to do dehydration treatment. If the liquid to be tested is turbid, let it stand for a while, and then take the clear part for testing after precipitation.