A bottle contains 50 strips of test paper and is equipped with 5 waterproof packages for easy carrying and storage, ensuring long-term use.Colorimetric is simple, rapid and accurate to measure cyanic acid, total hardness, total bromine, residual chlorine, pH value and total alkalinity in water. The color chart is easy to read and will not fade with time.A bottle of 50 pieces is simple and practical, which can meet your .Strip design takes into account different application scenarios such as commercial use and domestic use, and is an efficient and accurate for testing chemicals in water.Our products are widely used in tap water, drinking water, aquarium, pond water and other scenes to effectively help our customers understand the chemicals in water.Name:7-in-1 water quality test paperSpecification:1 bottle of 50 piecesColour:As ShownMaterial:PlasticPackage Contents:1 * Water quality test paperOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.