Volvox Algae Under Microscope - 400x Stock Photo - Image of brightfield, grand: 134291130
File:Celery Cells (400x).jpg - Wikimedia Commons
ACCU-SCOPE 3000-LED-40 Binocular Biological/Cytology Microscope, 400x Magnification - New York Microscope Company
USCAMEL 40X-400X Microscope for Kids and Students, Dual LED Illumination Beginner Biological Microscope with Slides for School Laboratory Home Education : Amazon.com.au