The JC300 allows the user to study a much larger field of view than standard fingerprint magnifiers. A thumbscrew allows fast and simple focus adjustments. Images appear sharp and focused over the entire viewing area. The 3.2x wide field magnifier is constructed with a sturdy aluminum frame. The magnifier weighs 15 oz and measures 4.5” x 4.25” x 3”. 3.2X Wide Field Magnifier.