Fantasy is easy: That would be Excalibur and it's scabbard. Great sword fit for a king, but with the scabbard you don't lose any blood, no matter how much you are injured.
Sci-Fi: Toss-up there between Thor's Hammer and Green Lantern's Power Ring. I have to go for the hammer though, the whole worthy thing appeals to me, plus I know I would forget to recharge the ring.
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