|A small brass non-magnetic screwdriver blade is ideal for adjusting magnetic compasses.This blade is durable, corrosion resistant, and can be put on a key chain until needed.|
Works as advertised. Works well to swing a compass.
Kinda expensive for a little sliver of copper, but its well-made.
Its small and what I love about it, is that I always have it with me because I keep it on my keychain.