The 14-in-1 test strips test for Total Alkalinity, PH, Water Hardness, Lead, Copper, Iron, Mercury, Chromium/Cr(VI), Bleach, Nitrate, Nitrite, Residual Chlorine, Sulfate, and Sulfite. For water quality testing in rural areas, residential rooms, well water, swimming pools, and more. The operation is easy and the results can be obtained quickly. Just dip it in and compare it to the large color chart on the bottle. This is helpful for our health care and will protect the behavior of our sink tub. Specification: [Save Condition and Length]: 1 Storage Conditions: Store in a dark place at 2C-9-130C (2C-9-18C). 2 Product efficacy: Store in a dry place between 2C and 30C, protected from light, for 24 months in the near future. 3 Expiry date after opening the bottle: After opening the bottle, the bottle cap should be sealed, and it should be placed in a dry place at 2C-30C, protected from light, valid for 24 months. [Sample request]: 1. Take a 5-10 ml sample and, after remaining still, take the supernatant for testing. 2. The test is carried out at about 25C. Test methods: 1. Dip the reaction area of the test strip into the solution to be tested for 1 to 2 seconds, take out the test strip, and drain the remaining water from the top. 2. After 1 minute, compare the color of the reaction area of the test strip with the color chart and update the test value of the solution to be tested. 3. The colorimetric time should be controlled at about 60 seconds; too long or too short will affect the reading. Precaution: 1. When removing the test paper, do not operate the reaction end of the test paper, so as not to contaminate the test paper and affect the test results. 2. After removing the required number of test strips, store the remaining test strips in a closed and dark place. 3. The liquid to be tested should remain colorless or light in color. When a liquid that is too dark in color is detected, it can first be removed with an activated carbon adsorbent. If the liquid to be tested is relatively turbid, please let it stand for a while and clean it after standing. Test items: total alkali, nitrate, nitrite, pH, severe solution, total chlorine, porosity, calcium, VC, chromium HCC. Test time: 60s. Scope of application: suitable for rivers, parks, swimming pools and hot springs, industrial water, reservoirs, hot spring water. Note: The data are all manual measurements, please allow an error of 1-3cm. Due to the difference in light and display, there will be a certain color difference, whichever is the actual object. Received Delivery Quantity: (according to the main picture)