Fowler 52-664-009 Pocket Optical Comparators, 10X Magnification

Optical comparator with 10X magnification and set of nine reticles for measuring line thickness, screw threads, angles, radii, circles, degrees, and length Glass lens provides high-resolution images Scales are photo-etched onto a glass reticle for accuracy and distortion-free viewing Set of nine reticles includes thickness and hole reticle; line thickness reticle; circle, square, and angle reticle; metric screw thread reticle; inch screw thread reticle; angle reticle; inch/metric linear scale reticle; metric reticle; and a circle, angle, and concentric circle reticle A dioptric number and a magnification number are not the same thing. Diopter strength represents a specific magnification power (X). For example, a 5-diopter provides 2.5X magnification (at a distance of 8")