iPad mini 4 compatibility
I’m curious to know what kind of Apple Pencil to buy to use on a iPad mini 2
iPad mini, iOS 12
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There is no Apple Pencil which is supported on iPad Mini 4 or iPad Mini 2 (since you referred to 4 in your subject, but 2 in the question.
The latest Mini which is Apple Pencil Capable is iPad Mini 5.
You can buy aftermarket devices, which work with some degree of success. Adonit is a brand you could look at.