My butter cutter.

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I have never ever used it to cut butter, but it is amazing for perfectly even slices of cheese. For parties, I can take a rectangle block of cheddar, monterey jack, you name it, and in one fell swoop have it all sliced up for crackers.

The one I have is an antique from East Germany, but you can buy new ones on the cheap: https://www.amazon.com/HIC-Butter-Stainless-7-75-Inches-2-625-Inches/dp/B009J9A562