Used for quick and convenient detection of residual chlorine concentration in water. Ideal for monitoring disinfection levels in drinking water, swimming pools, spas, and wastewater treatment systems. The test paper provides a colorimetric response that can be compared to a standard color chart for accurate measurement within the 50–2000 ppm range. Commonly used in field testing, quality control, and routine maintenance to ensure effective sanitation and compliance with health standards. Each pack contains 100 pieces, suitable for repeated use in various water safety applications.