Features: Upgrade 14 in 1: Test total alkalinity, pH, hardness, lead, copper, iron, mercury, chromium/hexavalent chromium, bromine, nitrate, nitrite, residual chlorine, fluoride, sulfite Health: Test strips for drinking water, taps, well water, fresh water tanks and more water testing. Use professional healthy drinking water test paper to test whether the water quality is up to standard. Easy to use: immerse the drinking water test paper in 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 a reading. Drinking water test strips are easy to use, even for beginners. Eco-friendly: Made of eco-friendly PET material Easy to carry: It is about 14cm long and weighs about 7oz, easy to carry. Instructions: 1. Dip the test strip in water for 5 seconds. 2. Take it out and wait 30 seconds. 3. Compare the drinking water test strip with the color chart on the bottle. Tips: Keep away from light and moisture. After removing the strap, put the cover on quickly. Do not remove harmful substances Do not touch the detection area of the reagent strip. Specification: packing list: Option 1: 50 pcs X Drinking Water Test Strips Option 2: 100 pcs X Drinking Water Test Strips Products from LUOLV's store