Pen Microscope Application: 1. Biological 2. Medicine 3. Ore&Jewellery 4. Plate-making 5. Textile 6. Currency&Stamp 7. Industrial-printed circuit boards 8. Precision parts 9. Gardening 10. Family&Office 11. Beauticians 12. Medical-veterinarian 13. Geology 14. Printing. Style: 25, 50x, 100X, 150X for choice