Size: ⊘47mm*13mm
How to use the compass:
The compass must be placed horizontally. At the same time, in order to avoid confusion of the magnetic needle, keep a certain distance from the object containing magnetism. The specific method is as follows:
1.>10 meters away from the wire fence;
2.>55 meters away from the high-voltage line;
More than 20 meters away from the car or airplane;
It is more than 10 meters away from objects containing strong magnetism, such as various magnets and external magnetic speakers;
It is more than 0.5 meters away from objects with weak magnetic properties such as magnetic snaps.
Precautions:
Use in a horizontal state to ensure accuracy as much as possible;
In order to avoid confusion of the magnetic needle, please keep a certain distance from the barbed wire and objects containing magnetism during use;
Do not hit the object with the surveying ruler, so as not to affect the measurement accuracy;
The disk surface and lens should be kept smooth and clean, do not wipe with dirty cloth or hands;
It should be closed when not in use and placed away from ferromagnetic materials to avoid loss of magnetism.