1. Made with high-quality materials for reliable performance 2. Multi-functional speed and counting meter with speed measurement and counting capabilities 3. Compatible with Hall switch, metal proximity switch, infrared proximity switch, and other detection signal switches 4. Features high sensitivity, high reliability, strong anti-interference performance, 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 Installation: 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 N pole of the magnet is effective. Securely mount the Hall switch and motor using a bracket; do not hold the Hall switch manually during motor speed measurement. Fix the magnet on a large-diameter shaft. The rotating disc should be as concentric and horizontally aligned as possible. Wobbling or non-horizontal rotation may result in failed detection. 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: ±1-3cm.