[EPA-Compliant Detection] This water test strip is designed and manufactured in accordance with EPA standards. Each test detects contaminants at EPA-recommended levels. [16-in-1 Water Quality Test Kit] This test strip measures 16 key parameters: pH, hardness, lead, iron, copper, mercury, alkalinity, nitrite, nitrate, bromine, free chlorine, total chlorine, fluoride, chromium, carbonate, and cyanuric acid—covering major factors affecting swimming pool, hot tub, spa, and drinking water quality. [Accurate and Reliable Testing] Developed through years of research and testing, this water quality test strip delivers precise, consistent results. It is suitable for educational and general-purpose water quality assessment. [Cost-Effective] Includes 100 test strips—enough for 100 tests. Testing twice weekly provides up to 6 months of use. Simple, fast operation saves time. [Widely Applicable] Ideal for testing drinking water, swimming pools, hot tubs, spas, ponds, aquariums, and other water sources. Material: Paper Color: As shown Package Includes: - 100 x test strips - 1 x test tube - 1 x dropper Note: Color may vary slightly due to screen settings and lighting. Measurement tolerance: ±1–3 mm.