To operate, attach riders to the scale arm at the numbered
positions. The carriage is held down firmly by hand and moved
in the opposite direction, to cause a trailing scratch. The large
standard rider loads 100 g per division, while the small rider
loads 25 g per division. This small rider may be used for making
low-range measurements involving small increments of pressure,
or it may serve as a vernier with the large rider in making more
precise medium-range measurements.
- Scratch Hardness
The force necessary to cut through the film to the substrate.
- Adhesion
The force required to scrape a path through the film, when the
stylus begins its motion on an uncoated portion of the panel.
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