The Pilot Watch with slide rule!
This watch from Torgoen will allow you to step back in time a little bit. Featuring a circular slide rule that can solve time, distance and speed equations, it can also perform a wide variety of calculations. These include currency conversions, multiplication and division and any conversion of a linear nature such as ounces to grams, kilograms to pounds, miles to kilometers, etc.
Once before an undergrad surveying class, my calculator bit the dust, & I showed up to take the final exam with an actual slide rule (which I still have). After my prof got over his initial shock, he was at least a little impressed that someone actually knew how to use one.
If that watch wasn't so expensive, it'd be fun to have.
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