Fritsch planetary micro mill PULVERISETTE 7 premium. As an extension of the existing classic line planetary mills, FRITSCH is offering a premium line generation for the first time. For the first time, you can achieve unprecedented speeds and thus ultra-fine grinding results down to the nano range. FASTER, EASIER AND SAFE than ever. Max. Feed size: (depending on the material) 5 mm. Max. Sample amount: 70 ml. Final fineness: