This 6X Pocket Comparator has hundreds of applications in industry, in the laboratory and at the workbench. Resting directly on work surfaces, it is ideal for checking small parts, linear measurements, angles, hole diameters and thread sizes. Unlike lower priced comparators with only a simple lens, the 6X incorporates a triplet lens. It provides an extremely flat field over the entire reticle area. Clear acrylic cell allows outside light to illuminate the subject. Accepts all 27mm reticles. Reticle is made from quality optical glass.