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5-Point Calibration Online Sg pH Meter Controller for Power Plant. 5-Point Calibration: Supports 5-point calibration for high precision measurement. IP66 Waterproof: Sealed enclosure isolates pollution and corrosive gases. Multi-Function Relays: 2* SPST relays with max load 3A/250VAC for control. RS485 Communication: Supports Modbus RTU protocol for data integration. Temperature Compensation: Built-in function for accurate temperature detection. Password Protection: Settable password prevents unauthorized misoperation. Power Failure Protection: Indefinite retention of parameters during power loss.