Step 3Fire it up!
The big numbers are its speed in hundred of rpm. In the picture, it is spinning at 2810 RPM.
The best part about using a cyclocomputer is that it automatically records how much time the device has been spinning. In the picture, it has been running for 0 hours, 13 minutes, 21 seconds. This could be useful if you wanted to (for example) change the oil on an engine every 100 hours of operation.
The cyclocomputer also records maximum and average speeds, which could be useful in some situations.
Troubleshooting:
If no speed shows up, try moving the sensor closer to the magnet, and make sure that the cyclocomputer is set to display speed. If it still reads nothing, move a magnet back and forth past the sensor by hand. Numbers should appear. If they don't, the wire could be broken. They are pretty flimsy.
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