Hardware Overview: Magnabrite Magnifier
The base of the magnifier is slightly concave to reduce the risk of scratching or damaging the lens surface.
The Magnabrite is pre-focused and has an "infinite eyepoint." This means that the user's eyes can be any distance from the magnifier, at nearly any angle, without loss of clarity. Thus, there's no need to hunch over the magnifier, and several people can view the subject at the same time.
To use, simply glide the Magnabrite over any surface. There are no bulbs, batteries, or moving parts.