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Advanced Residual Chlorine Testing Kit for Pools & Water. Customizable Wavelengths: Any wavelength within 340nm-700nm range can be customized. OEM and ODM Services: Full customization, minor customization, and flexible options available. 1-Year Warranty: Comprehensive 1-year warranty coverage for the device. Large Data Storage: Stores 200 factory curves and up to 100,000 data records. Portable Design: Lightweight at 4.5kg, ideal for convenient on-site detection. Automatic Calibration: Eliminates manual calibration needs with automatic wavelength selection. ISO9001 Certified: Manufactured under strict ISO9001 quality management standards. USB Data Transfer: Includes USB interface for easy data export to computers.