Technical Specifications
| Telescope | AT B2 AT B3 A |
| Length | 8.46 in ( 215 mm) 8.42 in ( 214 mm) 8.42 in (214 mm) |
| Magnification | 32 x 28 x 24 x |
| Objective Aperture | 1.65 in (42 mm) 1.42 in (36 mm) 1.26 in (32 mm) |
| Resolving Power | 3” , 3.5” 4” |
| Field Of View (at 100 m or 328 ft) | 1° 20‘（2.3 m or 7.5 ft） 1° 25‘（2.5 m or 8.2 ft） |
| Minimum Focus | 7.9 in ( 0.2 m)from end of telescope 1 ft (0.3 m) from instrument center |
| Image | Erect |
| Stadia Constant | 0 |
| Stadia Ratio | 100 |
| Accuracy | 0.0006 mi (1 km) double runievelling |
| Without Micrometer | 0.02 in (0.55 mm) 0.06 IN (1.55 mm) 0.08 in (2.0 mm) |
| With Micrometer | 0.02 in (0.5 mm) N or A |
| Setting Accuracy | 0,3”, 0.5” |
| Working Range | ±15’ |
| Sensitivity | 393.70 in or 78.74 in (10 mm or 2 mm) |
| Diameter | 4.1 in (103 mm) |
| Minimum Division | 1° or 1 gon |
| Water Resistance | IPX 6( IEC 60529:2001) |
| Width | 5.12 in (130 mm) 4.8 in (122 mm) |
| Length | 8.46 in (215 mm) 8.4 in (214 mm) |
| Height | 5.51 in (140 mm) |
| Operating Temperature | -4 °F to 122 °F (-20 ℃ to 50 ℃) |
| Weight | 407.85 lb (1.85 kg) 33.06 lb (1.5 kg) |
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