A small wad of absorbent cotton on a short thin stick, used for cosmetic or hygienic purposes.
- If you make a mistake, wipe away the pencil mark with a cotton swab dipped in rubbing alcohol.
- There are low-tech collection tools such as a cotton swab, and more sophisticated detection tools, including a handheld ultraviolet light unit.
- Use a cotton swab to apply a small amount of the medication.
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