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Package includes: Tachometer x 1 Hall NPN proximity sensor x 1 Magnet x 1 Holder x 1 Wire x 1 Product specification: Clear zero time: about 10s. The greater RPM value, the longer clear zero time. Refresh frequency:120-1200RPM(0.2-0.5S);2400-9999RPM(0.25-0.06S) . Measure accuracy: RPM5000,±3. Detection range: 1-5mm Proximity output current: 200mA Detected objects: magnet Operating temperature: 0 to 50°C. Note: 1.Please confirm that all the wires are connected correctly. 2.The direction of the magnet must be correct. If it is not correct, please flip the magnet. 3.The distance between the magnet and the sensor must be kept at 2-3mm (0.07"-0.12").