【Water tester】: The soil test paper is simple and practical, and can complete the test in a short time. It can resist VC interference and can detect soil PH 0-14 【Validity period】: The 5m roll Ph test paper must be stored in a dry and dark place at 2°C to 30°C (preferably stored at 2°C to 8°C). The product is valid for 24 months. The barrel lid must be sealed after opening the bottle, and the validity period is 6 months 【Material】: The pH tester is made of paper material, professionally manufactured, fast and accurate measurement, and improves detection efficiency 【Easy to use】: Soil test reagent strips, high reliability, easy to use, time saving and labor saving 【Widely used】: The measurement test paper set is suitable for lawns, water quality, farms, cosmetics, etc. It is a practical gardening product Specification: Test method: first immerse the test paper reaction area in the test solution for 1-2 seconds, take out the test strip and remove the excess water on it. After 1 minute, compare the color of the test paper reaction area with the colorimetric card to determine the test value of the test solution. The colorimetric time must be controlled within 15s Precautions: When taking out the test paper, do not touch the test paper reaction end to avoid contaminating the test paper and affecting the test results. After taking out the required number of test papers, seal the remaining test papers and store them away from light. The liquid to be tested should be kept colorless or light colored as much as possible. If the liquid to be tested is turbid, it can be left for a while, and the clear part can be taken for testing after precipitation Size Chart: 5 m/196.85 inch Package Includes: 1x Roll (5m Ph Test Paper) Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.