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Manual Knife Sharpeners

Can a compact, inexpensive tool keep your kitchen knives in top shape?

What We Learned

Japanese bladesmiths have long favored chef’s-style knives with blades that are ultraslim—that is, sharpened to about 15 degrees on either side of the blade—and for good reason: In addition to being thin and lightweight, these blades have a supernarrow cutting edge, which helps make them razor-sharp. We’ve also come to favor a thinner edge. After years of testing dozens of chef’s kn...