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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 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 enlarge 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?
- 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
Anthony Elmore
Reviewed in the United States on December 30, 2021
Initially gave this a fairly poor review, and I still say the focal range is just awful... but I can't deny that the quality is good. It's got a pretty good range of reticles. One of the combination reticles has graduations of .05mm for the first mm of it, which is pretty handy. Kind wish it came with a circular angle reticle that had 1 degree graduation around the entire circle, but it's more of a preference than a real problem. Biggest complaint is still the inability to focus to control the focus enough to be used without glasses
Steamboat Ed Haas
Reviewed in the United States on August 21, 2020
Nice selection of reticles but lacking the one I really needed. Will have to dig around to find the right one somewhere else.
LabControl
Reviewed in the United States on September 8, 2019
I place my order for 3 units, the packing come in different color, the boxes are broken, and I didn't see the brand Fowler in my optic comparator.. I spent 265.11 dollars, and the items looks cheaper.
Yuliya
Reviewed in the United States on February 1, 2015
No instructions included . Focal point is too short , you have to touch part to see profile , plus if the diameter of the part a little bigger this thing becomes useless .
Krutch
Reviewed in the United States on April 17, 2015
Preforms as it should. I wish it had a clear unmarked lens included for unobstructed viewing of some details. Very satisfied.
Hephaestus01
Reviewed in the United States on February 18, 2014
The Pros: Comes with lots of reticles (inch, metric, angles, thread pitch, line thickness, etc.); Reticles have little plastic storage cases that fit in the storage box; Unit made in China, but seems solidly built; Has diopter adjustment; Reticle and/or light pipe can be unscrewed for unobstructed magnification.The Cons: 21mm makes for limited light transmission and FOV (Field-of-View). If you use a "busy" reticle, you will have to dodge and weave to see/read the extreme points of it. Would be nice if the diopter let you use it without glasses/contacts, but this seems to be an industry norm for all scale loupes (that or they are tuned for far-sighted people).Works well enough for me. As long as you don't plan to use it for hours on end frequently, it is worth getting. It would be tiring to use it too much. I don't know if an illuminator would improve the light transmission.
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