Test the surface energy (dyne level) of film and other nonabsorbent surfaces before printing, coating, or laminating. A continuous line will appear if the material meets the tester's surface energy level, while insufficiently treated material results in air bubbles and a disappearing mark.

Bottles contain a solution that should be applied with a cotton swab.

Pens work similar to a felt-tip marker. They’re also called dyne pens.