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Smart Sandwich Ultrasonic Water Flow Meter RS485 Modbus Pulse Output. Long Battery Life: DN15-DN150 lasts over 10 years; DN200-DN300 lasts over 6 years. Robust IP68 Protection: Waterproof up to 2 meters underwater with no moving parts. Wide Communication Options: Supports RS485, MBUS, USART, and photoelectric interfaces. Customizable Design: Customized product name, diameter, and sensor types available. Durable Material Construction: Available in copper, ductile iron, and carbon steel. Extensive Data Storage: Records 512 days of cumulative flow using EEPROM/FLASH. CE Certified Quality: Fully RoHS compliant and manufactured under ISO standards.