Japan Brand B40A Survey Auto Level Specialized Automatic Level Surveying Instrument
| Model | B40A | ||
| 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.) | |
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