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High Precision Phbj-261L Portable pH Meter for Water Quality. 4.3-inch Touchscreen: Color LCD display supporting Chinese and English languages. IP65 Protection Rating: Dust and water resistant design for portable field testing. Firmware Upgrade Support: Enables feature expansion and customization via software updates. Multi-point Calibration: Supports 1 to 8 points for pH and 1 point for ORP electrodes. Extensive Data Storage: Stores 1000 sets of data with GLP compliance for traceability. Wireless Connectivity: Built-in Bluetooth and USB port for PC and LI MS system connection. OEM/ODM Services: Full customization available from samples or designs.