Sufficient quantity: you will receive 2 boxes of 50 pieces, a total of 100 pieces of test strips in the package; 50 Refills in a sealed aluminum foil bag; Please use the bottled test paper first, and tighten the bottle after use to prevent the test paper from being contaminated by moistureQuality material: 4 chemical indicators can be tested simultaneously on one test paper, and each test paper is composed of quality fiber paper and color blocks; Designed for hot tub and spa water, it provides quick and reliable results to verify water quality, providing fast and accurate resultConvenient to use: the test strips just soak in water for 2 seconds, then take it out, hold the test strip horizontally for 15 seconds, compare with the color chart on the bottle within 30 seconds to obtain clear and accurate water quality results; It is recommended to use the product at room temperature, otherwise the data will be inaccuratePractical design: Our bottle body is designed with color cards, different color cards represent different values, analyzes 4 chemical factors; Chlorine, bromine, alkalinity and pH; After you use the test card, you can quickly understand the 4 indicators of the swimming pool, bath and other placesWidespread application: it is can be applied in your swimming pool, spa or hot hub frequently to keep the water clean; your swimming pool, spa or hot bath and it's important to test them at least twice a week