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All have a guard, so the blade does not contact the pan. A plastic guard might be marginally better than a metal one, but you would have to be aggressive to mar or scratch a pan with either. Mostly you move the blender up and down, or just run it lightly over the pan bottom. There's no point in banging or scratching the pan with the guard.
That said, if I do use an immersion blender in a pot, it is most likely a stainless steel sauce pan. The contents will be deeper than in a wider fry pan, and the higher rim protects against splatter. Nonstick is useful in a fry pan, but not so much so in a sauce pan. For small quantities it is best to put them in the deep cup that came with the blender.
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Mine, while corded has a plastic guard over the blade which prevents any metal parts from coming in contact with the pot.
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While mine is corded, it doesnt scratch. There is a plastic blade guard that prevents any metal parts from coming in contact with the pot.
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