1. Made with high-quality materials for assured quality 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. Sensor features high sensitivity, high reliability, strong anti-interference performance, and long-term stable operation 5. Wide range of applications, reliable performance, simple installation [Product Parameters] Input voltage: DC 824V Hall sensor: NPN type 5V Measuring range: 109999 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: Embedded [Note] Input voltage must be correctly polarized; do not connect to 220V AC household 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. Effective distance between Hall switch front and magnet must be less than 5mm; magnet's N pole is effective. Securely fix the Hall switch and motor using a bracket; do not hold the Hall switch by hand during motor speed measurement. Fix the magnet on a large-diameter shaft. The rotating disc must be as concentric and horizontally aligned as possible. Wobbling or non-horizontal rotation may result in detection failure. Color: As shown in photo Material: Plastic Package Contents: 1 x Machining Table 1 x Hall Switch Note: Light reflection and differences in display screens may cause slight color variations between the image and the actual item. Measurement error allowance: 13 cm.