L–23 magnifier with a metal steam
Magnifying glasses are optical instruments used for observation of the object with a certain increase, and those equipped with measuring scale are used to measure length.
Technical data:
| Magnification | 2.5 x |
| Focal length (mm) | 89.17 |
| Lens diameter (mm) | 48 |
| Linear field of view (mm) | 30 |
| Distance between the object and the surface of the lens – nominally (mm) | 85 |

