DETUCK® Foldable Map Compass Mirror Compass Professional Field Compass Adjustable Magnetic Declination User Guide:
Use the compass in a horizontal state, make the pointer can be free to rotate, in order to ensure the accuracy of the pointer.
To make sure the compass work correctly, please make it stay away from other magnetic objects that may disturb it’s function,such as: magnets, iron objects, metal objects, electrical appliances, mobile phones, watches, stereos, headphones, tapes, etc.
Don’t hit the compass against other objects ,so as not to affect the accuracy of the pointer.
Don’t approach high temperatures and avoid sun exposure.
Keep the dial plate and the lens clean, do not use a dirty cloth or hand to wipe.
Close it when not use, keep it away from ferromagnetic materials,especially bank cards and other magnetic cards.