Course 2 is titled "Micrometers and Dial Indicators." Snap, plug, ring, screw thread plug
, and thread ring gauges are the topics in Course 3, "Fixed Gauges." Course 4, "Surface Plate Equipment," includes information on gauge blocks, height and micrometer height gauges, and surface plate accessories.
This seal, in conjunction with an elastomeric backup seal, outperforms any SAE straight thread plug
Sporting a relatively small footprint, Lista cabinets are used to store tools of disparate sizes and shapes: reamers, endmills, wrenches, inspection equipment (such as ring gages and thread plug
gages), and other line tools.
In addition, development of Apeiron's Reference Precision Measurement Machine, a quarter of a million dollar machine based on its laser technology, has been funded by the Quality Engineering Test Establishment to measure thread plug
gages to 25 microinch accuracy for the Canadian defense industry.