| Customization: | Available |
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| Model: | at-B4 |
| Product Name: | at-B4 Auto Level |
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| TELESCOPE | AT-B2 | AT-B3 | AT-B4 |
| Length | 215mm (8.46 in.) | 215mm (8.46 in.) | 215mm (8.46 in.) |
| Magnification | 32X | 28X | 24X |
| Objective Aperture | 42mm (1.65 in.) | 36mm (1.42 in.) | 32mm (1.26 in.) |
| Resolving Power | 3 in. | 3.5 in. | 4 in. |
| Field of View | 1°20' | 1°25' | 1°25' (at 100m/328ft.) |
| (at 100m/328ft.) | (2.3m/7.5 ft.) | (2.5m/8.2 ft.) | (2.5m/8.2 ft.) |
| Min. Focus from end of telescope | 0.2m (7.9 in.) | 0.2m (7.9 in.) | 0.2m (7.9 in.) |
| Min.Focus from instrument center | 0.3m (1 ft.) | 0.3m (1 ft.) | 0.3m (1 ft.) |
| Image | Erect | Erect | Erect |
| Stadia Constant | 0 | 0 | 0 |
| Stadia Ratio | 100 | 100 | 100 |
| Focusing Knob | 2-speed | 1-speed | 1-speed |
| Sighting Aid | Peep Sight | Gun Sight | Gun Sight |
| ACCURACY | AT-B2 | AT-B3 | AT-B4 |
| Without Micrometer | 0.7mm (0.03 in.) | 1.5mm (0.06 in.) | 2.0mm (0.08 in.) |
| With Micrometer | 0.5mm (0.02 in.) | n/a | n/a |
| COMPENSATOR | AT-B2 | AT-B3 | AT-B4 |
| Type | Pendulum compensator with magnetic damping system | ||
| Setting Accuracy | 0.3 in. | 0.5 in. | 0.5 in. |
| Working Range | ±15 ft. | ±15ft. | ±15 ft. |
| CIRCULAR LEVEL | AT-B2 | AT-B3 | AT-B4 |
| Sensitivity | 10 ft./2mm | 10 ft./2mm | 10 ft./2mm |
| HORIZONTAL CIRCLE | AT-B2 | AT-B3 | AT-B4 |
| Diameter | 103mm (4.1 in.) | 103mm (4.1 in.) | 103mm (4.1 in.) |
| Minimum Division | 1°/1gon | 1°/1gon | 1°/1gon |
| GENERAL | AT-B2 | AT-B3 | AT-B4 |
| Water Resistance | IPX6 (IEC 60529:2001) | ||
| Operating Temperature | -4°F to +122°F (-20ºC to +50ºC) | ||
| Width | 5.12 in. (130mm) | 5.12 in. (130mm) | 5.12 in. (130mm) |
| Length | 8.46 in. (215mm) | 8.46 in. (215mm) | 8.46 in. (215mm) |
| Height | 5.51 in. (140mm) | 5.51 in. (140mm) | 5.31 in. (135mm) |
| Weight | 4.1 lbs. (1.85kg) | 3.7 lbs. (1.7kg) | 3.7 lbs. (1.7kg) |
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