Feature:1. Simple and Accurate: No need to be a professional. Get your results quickly whether it's your tap, well, filtered, or any other water source.2. Monitor Water Quality: A good testing method, which can save you time and money and monitor your water health status at all times.3. Easy to Use: Instant reliable results with simple and clear instructions. Simply dip and compare with a large color chart on the bottle.4. Water Testing: The home testing kit for your drinking water and well water. Great for kids' science projects and school classroom water testing.5. Wide Application: Water quality test paper can test various domestic water, such as drinking water, aquarium, swimming pool.How to Use:1. Wash the test bottle three times with the water sample to be tested, and take 5ml water sample2. Add 2 drops of reagent No. 1 and shake up the test bottle. Add reagent No. 2 and shake up the test bottle.3. Compare the color of the water sample with the color chart to determine the nitrite contentSpecification:Item Type: Water Test StripsMaterial: PlasticWater Quality Reference:Safety: ≤0.1mg/LGeneral: ≥0.15mg/LPoor: ≥0.25mg/L Package List:1 x Test Bottle1 x Nitrite Colorcard2 x Test StripsNote:1. After each inspection, the test bottle needs to be cleaned with tap water.2. The test agent contains chemical components, please use it carefully.3. Store at low temperature and avoid light, avoid children's contact.