- 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").
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 specific magnification power (X). For example, a
5-diopter provides 2.5X magnification (at a distance of 8"). The
higher the diopter, the more magnification a lens can provide. As
magnification increases, distance to the object (focal length),
and field of view (diameter, or narrowness of view) decrease.
Magnifiers and prescription eyeglasses have a diopter value, such
as 1.5 or 2. The dioptric strength of an accessory lens, such as
prescription eyeglasses or an eye loupe, must be added to the
dioptric strength of the magnifier to calculate total
magnification.
Magnifiers are devices used to the visual appearance of
an object or image. Magnifiers come in a variety of styles such
as hand-held, headband, standing, clip-on, eye loupe, and those
that hang in a necklace form, or fit in a trouser pocket.
Magnifiers are commonly made of plastic or glass. They can have
one or more lenses with varying magnification abilities, and can
have a binocular configuration with a single lens, or two
separate lenses. They are sometimes used with LED or fluorescent
light sources to help control viewing capabilities. Magnifier
ability is often expressed as magnification at a specific length.
For example, 1.75X at 14" means that when a magnifier is held at
14" from a viewer's eyes, the object will be magnified 1.75 times
(X) its actual size. As magnification increases, viewing areas
and focal length decrease. Magnifiers sometimes have a diopter
number, expressed as + or - D, which is a measurement of strength
(or power) of the lens. Some magnifiers are marked with a
dioptric number on the lens. A high diopter number has a higher
magnification than a low diopter number. Aspheric magnifiers,
unlike spheric magnifiers, produce a sharp image to the edge of
the lens for less distortion. Magnifiers are widely used in
jewelry inspection and fabrication, watch-making, needlework,
artwork, reading, print inspection, and stamp-collecting.
The Fred V. Fowler Company manufactures inspection and
measurement instruments such as electronic indicators, calipers,
bore gages, and digital scales. The company, founded in 1946, is
headquartered in Newton, MA.
What's in the Box?
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* Fowler 10X magnifying loupe
* Fowler 52-661-001 reticle
* Fowler 52-661-002 reticle
* Fowler 52-661-003 reticle
* Fowler 52-661-004 reticle
* Fowler 52-661-005 reticle
* Fowler 52-661-006 reticle
* Fowler 52-661-007 reticle
* Fowler 52-661-008 reticle
* Fowler 52-661-009 reticle
* Fitted case