Of course, there are many other high-tech gadgets popular among some of the more affluent and paranoid preppers - anything from satellite phones, to night vision goggles, to heated insoles. In all likelihood, none of that is worth the cost. If I had to pick two extravagant "doomsday" accessories that could conceivably be useful to some people if something truly awful happens to the world, I'd go with a waterproof hiking GPS unit and a portable Geiger counter. Both are powered by AAA batteries and cost around $140. (We'll talk about Geiger counters and their relative merits a bit later on.)
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