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.) |