A capillary is a small blood vessel from 5-10 micrometres in diameter. They are the smallest blood vessels in the body: they convey blood between the arterioles and venules. Physician could diagnose various kinds pf disease by checking up the nail capillary.
Dino-Lite Nail Microcirculation Scope has a magnification of 500x and can examine the capillary with magnified clarity and digitally record the image for diagnostic and other purposes.
Here are some Dino-Lite Microscope recommended for observing nail capillary :