TWX Auto level W3-36B
Technical data:
| Model: | W3-36B |
| Magnification | 36X |
| Compensator | Air Damping Compensator |
| Image | Erect |
| Objective Aperture | 38mm |
| Field Of View | 1°20′ |
| Minimum Focusing Distance | 0.6m |
| Stadia Ratio | 100 |
| Setting Accuracy | ± 0.5″ |
| Compensating Range | ±15′ |
| 1km Double Run Leveling | ±1mm |
| Circular Level Sensitivity | 8’/2mm |
| Horizontal Circle Graduation | 1° or 1gon |