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Smart phones. The caveat being you couldn't take one back in time and impress them because the internet and cellular network wouldn't be there.
I remember a great answer to this somewhere and they said a solar powered 4 function calculator is the simplest thing we have today that would blow people's minds. You really don't even need a scientific one to achieve the effect. Apart from the obvious (quick math, LCD display, and solar power) it also uses plastic.
You don't need a network to make a smartphone black magic. Just taking pictures is enough, but also single player games, calculators, word processors, image editors, music players, really any non-networked application is still magic to pre-computer people.
Well, for like a day or two then the battery dies! But yeah, it would still be impressive, I'm not saying it wouldn't. A time traveler must always ask themselves how long they intend on visiting!
You can bring a solar panel with you to keep it charged if you have a long visit of convincing people you're magic planned.