Features: The YC007 Pool Test Strip is a convenient and fast way to test your pool water. It displays seven major indicators (total hardness, free chlorine, total chlorine, cyanuric acid, total alkalinity, ph) simultaneously with high sensitivity. It is suitable for various groups of people such as public and private pool owners, outdoor pool owners, hot spring SPA owners, water park owners and bath center owners. It can be used in different scenarios such as public pools, private pools, outdoor pools, hot spring SPAs, water parks and bath centers. The YC007 Pool Test Strip is made of paper and is classified under the category of PH meters Specifications: Material: Paper Single One Size: Approx. 9x0.5cm/3.54x0.20in Package Includes: 100x Pool Test Strips note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.