ED&D's 10x Pocket Optical Comparator Set magnifies images which are sharp, undistorted and aberration free. Convenient for checking angles, thread measurements, hole sizes, as well as narrow creepage and clearance distances on circuit boards and within flex circuits. The illuminator attachment assists where additional light is required. The optical comparator, illuminator and the nine reticles are packaged in a durable wooden case. Interchangeable reticles allow measurement of diameters, radius, angles, thickness, etc. Includes 9 reticles, 10X Comparator and illuminator attachment.