What is a colonoscope?

A colonoscope is a thin, tube-like instrument used to examine the inside of the colon. A colonoscope has a light and a lens for viewing and may have a tool to remove tissue.

This answer is based on source information from the National Cancer Institute. 

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
The colonoscope is the instrument a doctor (usually a gastroenterologist) or technician will use to view the inside of the colon and rectum. It is a long flexible tube that has a lighted tip and a camera and when it is inserted into the rectum it magnifies the folds and curves of the colon onto a TV screen. When something looks suspicious it can be sampled for testing. Precancerous colorectal polyps - stalks of tissue that grow from cells in the colon's lining - can be snipped off at its neck right then and there.
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