A sample preparation device

A sample preparation device for preparing a sample containing particles collected onto a collection plate, characterized in that

• said sample preparation device comprises
• a holding device for securing said collection plate;
• and
• a device for punch cutting device provided with a sample collector;
• and
• a guiding device comprising two or more guide bores for receiving and guiding said sample collector,
• said guiding device extending
• a first length along a plane x between a first transverse side and a second transverse side;
• and
• a second length along a plane y, said plane y being perpendicular to said plane x;
• and
• a third length along a plane z, said plane z being perpendicular to both said planes x and said y, said third length defining a distance between a punch receiving side and a coupling side of said guiding device,
• said guiding device further comprising a centerline A extending parallel to said plane x dividing said guiding device into equally sized first half and second half, wherein said two or more guide bores are asymmetrically located relative to said centerline A in said first and/or second halves.