| Model | B40 | B30 | B20 |
| Telescope |
| Length | 215mm(8.46 inch) |
| Objective aperture | 32mm | 36mm | 42mm |
| Magnification | 24X | 28X | 32X |
| Image | Erect |
| Resolving power | 4" | 3.5" | 3.0" |
| Field of view(at 100m) | 1° 25′ (2.5m) | 1° 20′ (2.3m) |
| Minimum focussing distance | 0.2m (7.9in.) from end of telescope |
| 0.3m (1ft.) from instrument cener. |
| Reticle pattern | Cross hairs | wedge |
| Stadia ratio | 100 |
| Stadia constant | 0 |
| sighting aid | Gun sight | Peep sight |
| Focusing Knob | 1-speed | 2-speed |
| Lense hood | - | Retractable |
| Accuracy(standard deviation for 1km double run leveling) |
| Without micrometer | 2.0mm | 1.5mm | 0.7mm |
| (0.08in.) | (0.06in.) | (0.03in.) |
| With micrometer | | | 0.5mm |
| (0.02in.) |
| Compensator |
| Type | pendulum compensator with magnetic damping system |
| Working range | ± 15′ |
| Setting accuracy | 0.5" | 0.3" |
| Horizontal Circle |
| Diameter | 103mm (4.1in.) |
| Graduation | 1°/1gon |
| General |
| Sensitivity of circular level | 10′/2mm |
| Mirror for circular level | Plane mirror | pentaprism |
| Horizontal motion drive | Clampless, endless, double-sided knobs |
| Water resistance | IPX6(IEC60529) |
| Operating temperature | -20-+50°C (-4 to +122°F) |
| Size | 122mm× 215mm× 135mm | 130mm× 215mm× 140mm |
| Weight | 1.7kg (3.7 lb.) | 1.85kg (4.1 lb.) |
Complaint
