Manufacturer: Fred V. Fowler Company, Inc.
Brand: Fowler
Model: 52-664-009-0
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The Fowler 52-664-009 optical comparator has 10X magnification and a set of nine reticles for measuring line thickness, screw threads, angles, radii, circles, degrees, and length. A glass lens provides high-resolution images. Scales are photo-etched onto glass reticles for accuracy and distortion-free viewing. The set of nine reticles includes one each Fowler 52-661-001 thickness and hole reticle; Fowler 52-661-002 line thickness reticle; Fowler 52-661-003 circle, square, and angle reticle; Fowler 52-661-004 metric thread reticle; Fowler 52-661-005 inch thread reticle; Fowler 52-661-006 angle reticle; Fowler 52-661-007 inch/metric scale reticle; Fowler 52-661-008 linear scale reticle; and Fowler 52-661-009 circle, angle, and concentric circle reticle. Each reticle includes a protective plastic case and the set includes a fitted plastic case. Specifications52-661-001Thickness and hole reticle52-661-002Line thickness from 0.02 to 0.16mm52-661-003Degrees from 0 to 90°, with 1° and 5° divisions52-661-004Metric screw threads 0.25, 0.3, 0.35, 0.4, 0.6, 0.75, 0.9, and 1mm52-661-005UNF screw threads 4, 7, 8, 9, 10, 12, 14, 16, and 25 TPI52-661-006Angles: 0, 8°, 30°, 45°, 50°, 55°, 60°, 90°, and 117° Degrees: 180° to 270° in 1° divisions52-661-007Linear inch/metric scale with 0 to 0.6"/0 to 15mm measuring range and 0.005"/0.05mm graduation interval52-661-008Linear metric scale with 0 to 20mm measuring range and 0.01mm divisions52-661-009Degrees: 0 to 90° (one 10° degree area marked in 1° intervals) Circles: 0.1 to 1.0mm diameter and 0.005 to 1/16" diameter Inch scale: 0 to 0.5" (0.005" divisions); 0 to 1/8" (1/64" divisions)Linear metric scale: -10 to 0 to 10mm with 0.1mm divisions Angles: 29°, 50°, 55°, and 118° Radius: 0 to 90° (0.1 and 0.5mm divisions)Diopter (D) is a technical term for the measurement of the light curvature and thickness of a lens. A dioptric number and a magnification number are not the same thing. Diopter strength represents a speci...