16 IN 1 WATER TEST STRIPS: Drinking water test strips are contain 16 paramete, it can test Alkanlinity,pH, hardness,Cyanuric Acid, Chlorine, Free Chlorine,Free Bromine,Nitrate,Nitrite,Iron,Chromium,Lead,Copper,Mercury,Fluoride,Carbonate EASY & FAST TEST KIT: ONLY 3 Steps to results.Frist, Simply dip one test strip into water for 2seconds; Second, remove the test strip and hold it horizontally for 30seconds; Third, comparing strip to color chart for the reference. WIDE USAGE WATER TESTING STRIP: The test strips are apply for testing drinking water, home faucets, water, tap water, pool, hot tub and aquarium and quality test. For healthy, please use the professional drinking water test strips to detect water quality standards. 100PCS WATER TEST KIT: The water testing kits for drinking water including 100 Strips that means you can test drinking water for 100 at home for anytime. The economical and convenient water testing kit and school projects. color:As shown Material:Paper Package Contents: 1 set x water testing kits for drinking water(100Pcs) 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.