Water testing kits for drinking water is equipped with 16 major parameters which including: alkalinity/PH/hardness/cyanuric acid/ chlorine/free chlorine/free bromine/nitrate/nitrite/iron/chromium/lead/copper/mercury/fluoride/carbonate . 1.Dip the water test kit into water for 2sec and then remove the drinking water test kit. 2. Gently shake off excess water from the strips, hold the water testing kit horizontally for 30sec. 3.Compare the pads to the color chart over the 30sec to the results. This water test strips applies to tap water and water, also pool, , hot tub, and aquarium water, home water test kit is also a good helper for check water softener. 100 water quality tester mean 100 drinking water tests. You can test it yourself at home, and water tester for drinking water offer an affordable water testing option at a low cost, so you 't have to spend a fortune to test your water. Drinking water testing with drinking water test strips is a great way to help you your water supply easily. Colour:multicolor Material:Paper Package Contents: 1 set x Water Test Kits Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.