Features： *3 in 1 Pool and Spa water quality strips. *Easy to distinguish: Color difference is obvious, easier to compare the strip color to the color chart. *Do experiments at both ends of pool twice a week for best results. *Dip in water for instant reading and comes in easy-to-store container. *Perfect for swimming pool and spa. *Ideal water quality is based on accurate water quality testing. Take a test strip and immerse it in the swimming pool water for about 2 seconds. Take it out and lay it flat. After 15 seconds, compare the reading with the color card. Specification: Item type: Swimming Pool SPA Strips Material: Paper Color: As pictures Quantity: 100pcs(2 bottles) Swimming pool precision test strips, each test strip can test at the same time: Total (total ) test range 0-1-3-5-10; PH (acid-base value) testing range is 6.8-7.2-7.4-7.6-8.0-8.4; Total Alkalinity total alkalinity test range 0-40-80-120-180-240; Packaging: Each bottle is packed in 5 small aluminum foil bags, each with 10 test strips, and each bottle has 50 test strips. Package Contents: 2 bottles of Pool SPA Strips(100pcs) Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Our products are made from very durable, high-quality materials ,sure to meet the needs of your daily life. Before placing an order, we suggest that you always check the size and model of the product carefully to ensure that the selected product meets your actual needs. If you encounter any problems, please contact us in time, we will try our best to provide you with solutions until the problem is solved satisfactorily. After you receive the product, we attach great importance to your feedback, no matter how your comments, we will listen carefully. Every customer can enjoy the free after-sales service we provide, and any damaged or quality problem products can be refunded or exchanged.