Kasper & Richter Sherpa BW2
Here's what other sites are saying:
Kasper and Richter collaborated with the BRK Mountain Rescue Service and came up with the durable, precise Sherpa BW2 Sighting Compass. A lot of mirror-sighting compasses have adjustable declination and a triple sighting system, but the Sherpa BW2 Sighting Compass goes a few steps further with an unbreakable polished aluminum sighting mirror and a thermo-elastic, fluid-filled capsule. The Sherpa BW2 Compass' flexible capsule prevents bubbles that often occur with temperature changes and hairline cracks that appear after an accidental drop. Unlike fragile glass or Plexiglas, the sighting mirror's solid metal housing and a durable ABS lid put up with trail abuse.