The Magnabrite magnifier is the original light gathering magnifier since 1950. It is a superbly crafted, solid acrylic 4x magnifier with a unique characteristic: this affordably priced, American made magnifier actually intensifies the light that passes through it, making the magnified subject clearer and nearly four times brighter. There are no bulbs or batteries; innovative optical engineering and precision lens grinding are the power behind its performance. Magnabrite is pre-focused, so it stays in focus at all times. To use, simply glide the Magnabrite over any surface - focus is automatic.