| Year | 1989 |
| Date | 01-Dec |
| Volume | 163 |
| Issue | 3,862 |
| Page | 722 |
| Category | Workshop |
| Part | 6 |
| Title | Hardness Tester |
| Author | Dave Lammas |
| Notes | Describes the function and building of an instrument for the home workshop. The weight, zero indicating flag, wooden base box, accessories |