Many other lenses are available at very low cost. For normal photographic use the camera has an excellent ergonomic design. It is molded for a right-hand grip, and all controls are easily and instinctively accessible. Moving the micrometer knob moves a crosshair and double lines relative to the specimen and the scale. With high-power objectives, measurements can be made at the micron level.
Measurements are much more precise than when made with an eyepiece reticle scale.
A fitted wooden case is provided. This small assembly replaces and is equivalent to a 7x eyepiece, and lets a student and teacher simultaneously view a specimen. A movable pointer may be aimed at any place in the field of view, using a small lever similar to an electrical toggle switch. One person looks into the place of the original eyepiece, while the other looks into the end of the tube. The end of the tube may be adjusted for angle of view and focus.