Work hands-free with this convenient head-mounted magnifier. Ideal when examining fingerprints and other evidence, the OptiVISOR ® is lightweight and comfortable. An adjustable headband conforms to fit all head sizes and hold firmly. The two optical glass prismatic lenses are ground and polished to meet precision optical standards and both lenses are bevel-edged and mounted in an interchangeable plastic frame. Two levels of magnification 2x and 3.5x are available.