A. Features: - 14-in-1 upgrade: It can detect total alkalinity, pH value, hardness, lead, copper, iron, mercury, chromium/hexavalent chromium, bromine, nitrate, nitrite, residual chlorine, fluoride, and sulfite. - Health protection: The test strips are used for water quality testing of various water sources such as drinking water, tap water, well water, and fresh - water tanks. Professional drinking - water test strips are used to detect water quality standards from a health perspective. - Easy to use: Immerse the drinking - water test paper in water for 5 seconds, take it out and let it sit in the air for about 30 seconds, then compare the color with the color card on the back of the bottle to get the reading. Beginners can use the drinking - water test strips with ease. - Environment - friendly material: It is made of environment - friendly PET material. - Easy to carry: It is about 14 cm in length and about 7 ounces in weight, which makes it convenient to carry. B. Usage method: - Step 1: Immerse the test strip in water for 5 seconds. - Step 2: Wait for 30 seconds after taking it out. - Step 3: Compare the drinking - water test strip with the color card on the bottle. C. Usage tips: - It is recommended to store it away from light and moisture. - After taking out the test strip, close the bottle cap promptly. - Do not remove the desiccant. - Do not touch the detection area of the test strip. D. Specification parameters: - Package options: - Option 1: The package contains 50 pieces of drinking - water test strips. - Option 2: The package contains 100 pieces of drinking - water test strips.