Compass Usage:
The compass must be placed horizontally, and to prevent the needle from becoming disordered, it should be kept at a certain distance from magnetic objects. The specific method is as follows:
1. More than 10 meters away from the barbed wire.
2. More than 55 meters away from high-voltage lines;
3、离汽车或飞机>20米；
4. Stay away from objects with strong magnets, such as various magnets, external loudspeakers > 10 meters;
5. Objects with weaker magnetic properties, such as magnetic snaps, are greater than 0.5 meters away.

Notes:
1. Use in a horizontal state to ensure accuracy as much as possible.
2. To avoid the misalignment of the compass, please maintain a certain distance from iron wire mesh and magnetic objects when using;
3. Do not use a measuring tape to strike an object, which may affect the measurement accuracy;
4. The surface of the disc and the lens should be kept clean, and do not use dirty cloths or hands to wipe.
5. When not in use, it should be closed, and it should not be placed near magnetic materials to avoid the loss of magnetism.