| Clue | Source | Date |
|---|---|---|
| Ruler's marking time in most important place (10) | ||
| Small metric measurement | Family Time | 04 Mar 2019 |
| *Approximate width of a pencil | Wall Street Journal | 02 Apr 2018 |
| *Approximate width of a pencil | ||
| It equals 0.3937 inch | ||
| Metric measure | ||
| Almost two-fifths of an inch | ||
| Unit, as a Salk vaccine. |