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DFRobot Gravity Analog ORP Sensor Meter PRO is an upgraded version of Industrial Gravity: ORP Sensor Meter For Arduino. The ORP probe employs platinum indicator electrode and silver-silver chloride reference electrode, which makes it available for 24-hour online ORP monitoring and greatly enhances product durability. The new signal converter adds a more stable voltage reference so that the sensor readings would be no longer affected by supply voltage fluctuations. Besides, there are screws, copper columns, and waterproof connectors included in the accessory packet to help conveniently build up the ORP monitoring system.