Welcome to Comparison Microscope

A device used to analyze side-by-side specimens is called a comparison microscope or also known as stereomicroscope or dissecting microscope. It consists of two microscopes connected to an optical bridge that results in a split view window. The comparison microscope is used in forensic sciences to be able to compare microscope patterns and identify or deny their common origin. The two microscopes that are placed next to each other and the optical paths of each microscope that are connected together by the optical bridge would help the forensic examiners to simultaneously compare two specimens instead of depending their memory are the simple idea behind the comparison microscope. Handguns predominated as the firearm of choices in shooting-related crimes, especially in the United States of America. The fired ammunition components may acquire sufficient unique and reproducible microscopic marks to be identifiable as having been fired by a single firearm. Making this comparison is correctly referred to as firearms identification, or sometimes called as ballistics. The forensic discipline ultimately requires a microscopic side-by-side comparison of fired bullets or cartridge cases, one pair at a time, by a forensic examiner to confirm or possibly eliminate the two items as having been fired by a single firearm. The traditional tool of the firearms examiner has been what is often called the ballistic comparison microscope. Comparison microscope is essential for the forensic ballistic expert in comparing bullets and spent cartridge casings. The interior of a gun’s barrel is machined to have grooves that force the bullet to rotate as it travels along it. These grooves and their counterpart, called lands imprint groove and land impressions on the surface of the bullet. Imperfections on the barrel surface are incidentally transferred to the bullet’s surface. Since these imperfections are randomly generated, during manufacture or due to use, they are unique to each barrel. These patterns or imperfections amounts to a signature that each barrel imprints on each of the bullets fired through it. It is this signature on the bullets imparted due to the unique imperfections on the barrel that enable the validation and identification of bullets as having originated from a particular gun. Used to analyze the matching of the microscopic impressions found on the surface of bullets and a casing is the comparison microscope. Forensic examiners compare the ballistic fingerprint of the recovered bullet or cartridge case with the ballistic fingerprint of second bullet or cartridge case test fired from the recovered firearm is when a firearm or a bullet or cartridge case are recovered from crime scene. If the ballistic fingerprint on the test fired bullet or cartridge case matches the ballistic fingerprint on the recovered bullet or cartridge case matches the recovered bullet or cartridge case was also fired from the recovered gun. A link between a specific firearm and a bullet or cartridge case recovered from a crime scene constitutes a valuable lead, since investigators may be able to connect the firearm to a person, who may then become either a suspect or a source of information helpful to the investigation.

4X - 115X FORENSIC COMPARISON CSI INVESTIGATION MICROSCOPE BULLET + CARTRIDGE HOLDERS w/ USB PC DIGITAL CAMERA 3MPIXEL IMAGE CAPTURE Price: $ 5,279.90 Model: cr0035000m Shipping/Handling/Insurance: $ 89.98

USB computer connected 3Mpixel camera is included. Laptop is not included. Product Overview // Professional Low Power Forensic Comparison Trinocular Microscope! Great for Low Power Microscopic Comparison of Specimens! Image of Both Specimens is shown Side-By-Side for Detailed Analysis. Perfect for Crime Scene Investigation and Forensic Science! Analyze and Compare Bullets, Bullet Cartridge Casings, Scratch Marks, Wires, Fibers, Hair, and Paint Fragments. Polarization Capable: Includes both Polarizer and Analyzer for viewing under Cross Polarization Conditions. This enhances microscope features such as tiny scratches, and also allows comparing polarization properties of specimens. Each side of the unit is a fully functional microscope, with the ability to independently set the magnification and illumination. Two Separate Specimens can be Studied Simultaneously with a Split Screen Viewing. The Comparison Bridge brings Both the Beam Paths together. The two Images of the Objects under Examination can be Observed in the Field of View in Multiple Ways. They can be Observed together, Side-By-Side, Separated by a Thin Line that can be Moved to Either Side Allowing More or Less of Either Object to be Viewed. On the Extremes, the Field of View can show Only the Left Object or Only the Right Object. The Viewing also has the Capability to Overlap the Images, as well as Control the Amount of Overlapping. Includes Two Photo Ports, One for Still Camera and One for CCD Video Camera!

40X - 600X FORENSIC COMPARISON INVESTIGATION MICROSCOPE THREE ILLUMINATION METHODS TRANSMITTED - INCIDENT - EPIILLUMINATION METALLURGICAL CAPABILITY Price: $ 3,229.90 Model: cr0068000a Shipping/Handling/Insurance: $ 79.98

Product Overview // Professional High Power Forensic Comparison Binocular Microscope! Great for High Power Microscopic Comparison of Specimens! Image of Both Specimens is shown Side-By-Side in a Split Screen Viewing for Detailed Analysis. Perfect for Crime Scene Investigation and Forensic Science! Analyze and Compare Bullets, Bullet Cartridge Casings, Scratch Marks, Wires, Fibers, Hair, Paint Fragments, and Biological Specimens. Each side of the unit is a fully functional microscope, with the ability to independently set the magnification and illumination. Three separate illumination sources are built into the unit: transmitted light from the base, incident light from side mounted lamps, and through-the-lens epi-illumination for metallurgical applications.

40x - 1000x MAGNIFICATION HIGH POWER COMPOUND FORENSIC COMPARISON MICROSCOPE 3MPIXEL USB DIGITAL CAMERA Price: $ 3,129.90 Model: cr0080000m Shipping/Handling/Insurance: $ 79.98

USB computer connected 3Mpixel camera is included. Laptop is not included. Product Overview // High Power Forensic Comparison Trinocular Microscope! Great for crime laboratories where comparison of biological forensic evidence is examined under high power compound light microscopes. Image of both forensic specimens is compared side by side in a split screen. The divider line is movable so either left or right side microscope image can be fully viewed or partially viewed. If partially viewed, the other side's image appears. So image can be 100 percent of left, 100 percent of right, or any fraction. The dividing bridge optics has the unique ability to reverse the left and right image, so the left scope's image is on the right of viewing field, and right is on the left. Also, the divider line is clean and with no thickness. Other forensic comparison scopes have a thick divider line obstructing the comparison process. This forensic comparison microscope gives the cleanest division between images that we have seen. Perfect for crime scene investigation and forensic science educational classes! Forensically analyze and compare textile fibers, hair, dried paint, and various biological specimens on slides. Each side of the unit is a fully functional microscope, with the ability to independently set the magnification and illumination. The illumination source is contained in the base of each microscope and provides transmitted illumination to the forensic specimen.

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