This practical compass can be used to detect the presence of magnetic fields in watches, instruments, and other components. It features an arrow pointer which indicates the 'magnetic north' direction. The dial is clearly marked with the north, south, east and west points. Points in between are also marked including NE, SE, SW and NW in black for easy differentiation, as well as the full 360° range markers on the outside of the dial which are indicated in black as well. This set of compasses provide accurate pole direction and magnetic indication for a variety of tasks. These work well with our magnetizers and demagnetizers (sold separately). Sold in packages of 3.