A single tube with interchangeable eyepieces one end, and 1 or more objective lens (often on a revolving turret) the other end. Objects viewed through a monocular microscope will always look flat and without depth. Monocular microscopes are used to study true microscopic sized animals, plants and cells. Magnification ranges typically from 20x to 1600x with most useful observations being carried out in the 100x to 400x range. Monocular Microscopes are not recommended for very young children as they tend to produce a perspective which requires a slight degree of interpretation which young people may find difficult. Whole live insects are notobservable with compound monocular microscopes.