The pointer is sensitive, accurate, clear and scientific, and can be used in conjunction with maps.

Scale with Help Mirror

Matters needing attention :-

1. Do not close to ferromagnetic materials (such as artillery, tank, magnetite, etc.), high-voltage wires and electromagnetic devices when using and placing the North finger needle, in order to avoid errors and sensitivity reduction.

2. When the surface of PMMA convex mirror is dirty, it can be polished with white flannel cloth or degreased cotton, toothpaste if necessary, and it should not be polished with fingers or ordinary cotton cloth, paper and solvent.

3. When not in use for a long time, it should be kept in a ventilated and dry place to avoid mildew.