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Equipment

Home > Characterization and Evaluation of Fired Projectiles > General Riflling Characteristics > Equipment

Using a comparison or stereomicroscope, land and groove impressions can be measured using a variety of equipment:

  • Micrometer
  • Calipers
  • Glass measuring reticule
  • Electronic reticule
  • Digital measuring equipment and software
  • MP 6 optical projector (no microscope)
  • Machinist’s scale

Descriptions of each of the above equipment can be found in Module 7.

A technique used by many examiners for measuring the widths of land and groove impressions is the air gap method. This technique is fast and accurate, requiring only a calibrated microscope and a micrometer. Calipers can be substituted for the micrometer.

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