14 in 1 Test Items: Can test total alkalinity, pH, hardness, , copper, iron, mercury, chromium/Cr (VI), bromine, nitrate, nitrite, free chlorine, fluorine, sulfite.The water quality test paper can test various domestic water, such as drinking water, aquariums, swimming pools , spas, industrial water, ponds, hot tubs, etc. Also very suitable for children's Science Fair projects.Easy to use, just the drinking water test paper into the water for 5 seconds, keep it in the air for about 30 seconds, and then adjust the color of the back of the bottle to get the reading.Water quality should be tested every week. A pack of our test strips contains 50PCS drinking water test strips.The sealed package tank plays a role of moisture-proof, with a shelf life of up to 2 years, and it is easy to store and carry.Specification:Name: 14 in 1 Reagent Strips for Water Height: 14cm/5.5 inchPackage Includes:50 Pieces Water Test Strips :Easy to use:1. Immerse the test strip in water for 5 seconds.2. Take out and wait for 30 seconds.3. Compare the drinking water test strip to the color chart on the bottle.