Features: 1. Classical colorimetric analysis, multi level detection requirements, visual readings with colorimetric cards. 2. The test sample only takes 0 to 1 minutes, which is easy to carry for outdoor testing. 3. It is Packaged in a dry airtight barrel and airtight bag, which is durable and can be used for a long time. 4. The operation is simple, no other supplementary materials are needed, which saves time and effort. 5. Wide use.Suitable for Aquariums, Swimming Pools, Spas, Industrial Water, Drinking Water, Pond, Hot Spring Water, etc. Specification: Item Type: Water Quality Test Paper Specification Model: 50 Pieces Per Bottle Storage Method: Cool and Dry Place, Avoid High Temperature Test Items: Total Chlorine, Free Chlorine, Bromine, Ph Value, Alkalinity, Hardness, Cyanuric Acid Material: Test Paper Gross Weight: Approx. 32g/1.1oz Uses: Suitable for Aquariums, Swimming Pools, Spas, Industrial Water, Drinking Water, Pond, Hot Spring Water, etc. Package List: 1 Bottle x Water Quality Test Paper（50 Pieces） Features Classical Colorimetric Analysis: Meet multi-level detection requirements and provide visual readings with colorimetric cards, ensuring accurate water testing results. Quick Test Sample: Obtain results in just 1 minute, making it convenient for outdoor testing and on-the-go use. Durable Airtight Packaging: Packaged in a dry airtight barrel and bag, ensuring long-lasting durability for extended usage. Easy Operation: Simple to use without the need for additional materials, saving time and effort in water testing procedures. Wide Application: Suitable for various water sources including aquariums, swimming pools, spas, industrial water, drinking water, ponds, and hot spring water.