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Portable pH Meter for Water Quality Tester (ERUN-Sp3-Dl4). Auto Calibration & Recognition: Automatically recognizes 13 pH buffer solutions with 3 series options. IP57 Waterproof Protection: Dust and water resistant, suitable for harsh field environments. Intelligent Microprocessor: Features auto temp compensation, data storage, and self-diagnosis. Portable & User-Friendly: Compact design with non-slip gloves and convenient carrying case. Customization Support: Offers OEM/ODM services and flexible customization options.