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May 2007
Specimen marker

Instron (Norwood, Mass.) has developed the Hand-Operated Marker (HOM), a device designed for use with Instron’s noncontact video extensometers. The HOM allows for marks to be placed on a specimen with consistent size, color density and spacing. Inks subsequently will stretch along with the specimen, unlike traditional

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Posted on: 5/1/2007
High-Performance Composites

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Specimen marker

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Instron (Norwood, Mass.) has developed the Hand-Operated Marker (HOM), a device designed for use with Instron’s noncontact video extensometers. The HOM allows for marks to be placed on a specimen with consistent size, color density and spacing. Inks subsequently will stretch along with the specimen, unlike traditional stick-on paper dots that may move as the material is being strained, which can introduce error. The manufacturer says well-defined dots on specimens improve the video extensometer’s dot-tracking algorithm performance and tolerance for other video image error sources, such as background color and density variations.

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