
It is 1.75'' in diameter and weights less than 0.5oz so it is definitively suitable for a keychain, the attachment point is a small hole at the top that can be used for a split ring or to thread cord. It comes with a brass split ring which is a very nice detail since it is a non magnetic material.
The GID base after exposure to sunlight will glow bright for about 30 minutes to an hour and will be visible with a faint glow for many hours.
The compass has graduations every 5 degrees and numbers every 20 degrees, magnetic declination can't be adjusted.
In a small package the glow mate works very well and is a very nice compass for a keychain and it can be attached to backpacks or used as zipper pull.
You can read more and order from Bruton for $8.
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