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Free Chlorine Online Analysis Instrument Residual Chlorine Meter. Lifetime Maintenance Support: Provides lifetime maintenance service for the instrument. IP65 Protection Class: NEMA4X / IP65 rated for dust and water resistance. Dual Relay Control: Features 2 sets of relay contacts for high/low setting. Multi-Parameter Measurement: Measures Residual Chlorine, HOCL, pH, and Temperature. Wide Power Input: Supports 100~240VAC with super anti-interference design. RS485 Communication: Includes RS485 Modbus output for data integration. Factory Reset Function: One-key restore feature for easy factory settings. Password Protection: Prevents unauthorized operation with password security.