Conscientious

"Everyone who values optical/mechanical perfection and robustness will love the LEICA MP. By means of the use of high-grade materials and complex fabrication processes, the MP is designed for extreme longevity. The MP is independent of batteries and all its operating elements are made of metal, so that it withstands heavy duty use under extreme conditions." (link)

If I still had the money I'd buy me one right away.