Pen Type Microscope 50x w/LED Light Precision pocket "pen type" microscope slim enough to fit in your pocket. Comes with a pocket clip and a bright LED light to illuminate the object you are viewing. Has a beveled opening to gather and focus light, providing a distortion free inverted image. The scope is 5" high with a 1/4" OD eyepiece. Applications: Specimen examination in laboratories before sample preparation; Printed circuit board inspection especially for hair line cracks; Printing industry for "dot" measurement; Gemstone examination Features a 3mm inset scale with .05 divisions.