1. Made with high-quality materials for reliable performance 2. Multi-functional speed and counting meter with speed measurement and counting functions 3. Compatible with Hall switch, metal proximity switch, infrared proximity switch, and other detection switch signals 4. Features high sensitivity, high reliability, strong anti-interference capability, and long-term stable operation 5. Wide range of applications, dependable performance, and easy installation [Product Parameters] Input Voltage: DC 8-24V Hall Sensor: NPN type 5V Measuring Range: 10-9999 RPM Measurement Accuracy: ±0.1% Display Mode: 0.56 inch digital tube Hall Switch Wire Length: 1m Panel Opening: 76mm x 39.5mm (L x W) Installation: Panel mount (embedded) [Note] Input voltage must be correctly polarized; do not connect to 220V AC power [Magnet and Hall Switch Installation] Pay attention to magnet polarity during installation. When the magnet passes near the Hall switch, the speed should display. If no speed is shown, reverse the magnet's side. Ensure secure installation to prevent dislodging at high speeds. The effective distance between the Hall switch front and the magnet should be less than 5mm; only the magnet's N pole is effective. Securely fix the Hall switch and motor using a bracket; do not hold the Hall switch manually during motor speed measurement. Attach the magnet to a large-diameter shaft, ensuring the rotating disc is as concentric and level as possible. Uneven or wobbling rotation may cause detection failure. Color: As shown in photo Material: Plastic Package Contents: 1 x Machining Table 1 x Hall Switch Note: Lighting reflections and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: ±1-3cm.