16 Way Water Tester: These water quality test strips can test 16 parameters. You know Total Hardness, Free Chlorine, Iron, Copper, Lead, Nitrates, Nitrites, MPS, Chlorine, Fluoride, Cyanuric Acid, Ammonia Chloride, Bromine, total alkalinity, carbonate, pH in one dive. Wide Application: 16 parameters are almost everything you need to know about water. This water quality test kit applies to tap water and fountain water, including swimming pool, spa, hot tub and aquarium water, as the parameters of these strips are also included in our 16-in-1 water test strips. You can also check if your water softener is working. Reliable results in seconds: Three steps are all you need to do. 1. Immerse one strip in water for 2 seconds. 2. Take it out and hold it for 15 seconds. Please do not shake the tape without direction. 3. Compare with the color chart. Economic choice for healthy life: 100 strips in each bottle help you save a lot of time and money. The tightly sealed black bottle can hold test strips in a dark, dry place. More Strips Activated Before Use. Excellent Customer Service: Our first goal is to provide accurate results for people who lead healthy lives. If any doubts arise during use, please contact us. We always do our best to satisfy our customers.