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Solid and Liquid Relay Spdt PNP NPN Tuning Fork Level Sensor Switch. High Precision Vibration Principle: Uses piezoelectric crystal resonance for accurate level measurement. Robust Shell Protection: Die-cast aluminum or 316ss shell with IP65/IP67 protection rating. Flexible Output Options: Available with PNP, NPN, or DPDT relay output signals. Customizable Insertion Length: Fork ranges from 45mm to 3000mm to fit various tank depths. CE and ISO9001 Certified: Meets international safety and quality standards for industrial use. OEM and ODM Services: Custom branding and design solutions available for bulk orders.