I bought a military compass, but I didn't know what the copper wire was for. Who knows, please tell me
Through the gap, the plastic plate wire, reference 3.1, aimed at adjusting yellow scale line on the surface of the compass alignment can be included by copper wire, yellow line and pointer to determine the azimuth.
The seven level is very good
Put the plastic plate and the cover of the copper wire in the magnifying glass, perpendicular to the compass surface
