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Optical Comparator – used for intricate measurement of grooves (notches) and a variety of other precision machined shapes. An optical comparator (often called just a comparator in context) or profile projector is a device that applies the principles of optics to the inspection of machined parts.
Chevron Notch Cut Into a Ceramic Material Bar
Machined per ASTM C 1421 standards. This photo illustrates the actual Chevron-Notch we machine into a bar. This is a Standard Test Method of Fracture Toughness of Advanced Ceramics.
“CHEVRON” refers to the actual shape of the notch after machining.