Thinner and less expensive than the Currency Converter but you have to know the exchange rate and how to push the divide button.
Take our Walkabout Credit Card Calculator. So slim it fits in your passport holder, taking no more room than a credit card, and thus is always available. Solar powered so you never need to worry about a battery. (Until the sun goes out in a few billion years.) Black with gold trim, embossed with the Walkabout symbol, it contains an eight-digit memory.