This Grade-AA 20mm Button Compass is the best quality button compass available and is ideal for any mini survival kit. It is liquid filled and has a highly luminous dial. Its working temperature range is -20º F to 120º F and is water resistant to 100 feet (30 meters). Dimensions: 20mm (Slightly larger than 3/4") diameter x 8.1mm thick. Weight: 0.05 lbs
Elmer Fitzwillie Notes, " this is a small but durable compass, quick to settle after moving and makes a very good back-up. I have one super glued to my sheath on my bug-out knife kit. I recommend 2 compasses for piece of mind. Lost one in the woodsonce, I eventually followed my compass out, but questioned several times if it was defective. Having 2, even one this small is reassuring."