Compass usage:

The compass must be placed horizontally. At the same time, in order to avoid the confusion of the magnetic needle, the compass must keep a certain distance from the magnetic object. The specific method is as follows:
1, away from the barbed wire > 10 meters;
2, off the high voltage line > 55 meters;
3, away from the car or plane > 20 meters;
4, apart from the strong magnetic objects, such as a variety of magnets, external magnetic horn > 10 meters;
5, weak from magnetic objects such as magnetic clasp > 0.5 meters.

Notes:

1. Use in horizontal state to ensure accuracy as far as possible;
2. To avoid confusion of magnetic needles, please keep a distance from the wire mesh and objects containing magnetism when using;
3. Do not hit the object with the measuring ruler to avoid affecting the measuring accuracy;
4. The disk and lens should be kept smooth and clean, do not use dirty cloth, hands to wipe;
5. When not in use, it should be closed and placed away from ferromagnetic material to avoid loss of magnetism.