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Author
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Topic: Harry Potter ok with white light but not red led
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John Pytlak
Film God
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Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 06-07-2004 10:16 PM
Edmund Scientific and others have a variety of measuring microscopes and loupes that have accurate reticles:
http://www.edmundoptics.com/onlinecatalog/DisplayProduct.cfm?productid=1600
quote: 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.
http://www.edmundoptics.com/onlinecatalog/DisplayProduct.cfm?productid=1727
quote: Extremely portable comparator is only 1-3/4" high x 1" O.D. Its glass reticle is superior to film reticles in many other pocket comparators which can bend, warp or become damaged due to oils or solvents. Optical lens system is distortion-free right to the edge of the field. Cell of transparent Lucite admits plenty of light to reticle and work. Accepts all 21mm reticles.
Reticle Description: A special feature of the reticle is the tickness comparison scale (E). A series of parallel lines 0.002" to 0.007" apart enable visual and direct measurement of the thickness of materials. Mechanical measurements of such items are sometimes inaccurate, because materials often compress. Linear scales are provided in bot millimeters (B) and decimal inches (C). The 10mm long metric scale is divided into units of 0.2mm. The 0.5" decimal inch scale is marked in units of 0.005". Scales to compare hole diameters read in fractions from 1/64" to 1/16" (A) and in decimals from 0.005" to 0.050"(D). Both the reticle and the object to be measured are magnified 6 times.
http://www.edmundoptics.com/onlinecatalog/DisplayProduct.cfm?productid=1854
quote: Our portable and compact direct measuring field microscope can conveniently travel from the desktop to the job site for critical inspection and measurement. Each scope includes focus ring for crisp, clear images. Using the reticle focus adjustment, the 1/20mm scale reticle can be brought into sharp focus when superimposed on the internal image. Clear acrylic base allows the instrument to rest directly on a flat object, while passing ambient light. Two cutaways (180° apart) in the clear base allow fine instruments to touch the object under inspection. The base can be removed to accomodate irregular objects. The base and bottom macro lens can be removed for added flexibility as an erect-image 8X telescope for long distance requirements. Padded storage case included. Reticle: 2.5-0-2.5mm, 0.05mm incr. Note that focus ring is on the removable macro lens.
http://www.edmundoptics.com/onlinecatalog/DisplayProduct.cfm?productid=1639
quote: These powerful direct measuring scopes are no larger than a fountain pen. Available in your choice of a measuring glass reticle in metric or inch scales. Can be purchased with or without optical clear plastic base. Stands only 4 1/4" high and weighs two ounces. The 50X magnification provides quick, close examinations to detect flaws or imperfections, make surface measurements or examine fibers or print. Base (1 1/2" O.D.) converts the unit to a free standing microscope that can be focused and locked. The inch reticle length is 1/10" with 0.001" divisions. The millimeter reticle length is 2.5mm with 0.02mm divisions. Made exclusively for Edmund Industrial Optics.
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