The "Pencil Pro 3" from 4smarts is not specifically mentioned in the sources provided, but based on the information available on iPad-compatible pens, here are some general insights:

- The "EasyPencil Pro 3" mentioned in one of the sources is compatible with several iPad models, but it is not compatible with the iPad Air 2. The iPad Air 2 does not support any of the Apple Pencil models or similar pens that require specific features of the newer models.

It is therefore unlikely that the 4smarts Pencil Pro 3 will be compatible with the iPad Air 2.