Watch out carefully for the Eclipse Brunton's. A bubble in a compass card type compass like these can stop the card from rotating completly.
I have had 3 compass capsules replaced by Brunton when a bubble locked up the card.
The design of these high end Brunton's is in my view completely unreliable in the field.
I have yet to have one of these Eclipse compasses make it to high elevation without completely siezing up.
A small to moderate sized bubble in a needle type compass is generally nothing to worry about...the same size bubble in an eclipse can push the compass card right off the pivot making it expensive junk.