Features：1、Suitable for drinking water, aquarium, fish tank, swimming pool, SPA, industrial water, pond, hot spring, etc. 2、Water tester to check water for 9 substances: Lead, iron, copper, nitrate, nitrite, water hardness, fluoride, total alkalinity, pH. 3、Water quickly tester, provides results in a matter of seconds. 4、High-quality water tester with precise colour coordination and high sensitivity. 5、There are 50pcs of water test strips in the package.Specification：Accuracy: 96%Material: PETQuantity: 50pcs/bottleFeatures: Anti-VC interference capabilityTest range: total alkalinity/pH/hardness/iron/copper/lead/nitrate/nitrite/fluorideTest Methods:1. Immerse the reaction area of ??the test strip in the test solution for 1-2 seconds, remove the test strip, and shake off excess water.2. After 1 minute, compare the reaction area of ??the test strip with the color of the color card to determine the test value of the test solution.3. Colorimetric time should be controlled at about 60s. If the time is too long or too short, it will affect the reading.Important matters:1. Do not touch the test area of ??the reagent strip.2. After removing the test strip, keep the rest of the test strip sealed and store away from light.3. Try to keep the liquid to be measured colorless or light-colored.4. Keep away from sunlight and moisture. Replace the cover in time after removing the slats.5. Do not remove the desiccant.6. Use within the validity period.Package List：1 * Water Test Strips