ougher smaller, and more tightly sealed against humidity and dust - for superior performance whatever the conditions. Better yet, this latest model is just a quick and easy to set-up, simple to sight, and immune to vibration, shock, and other environmental conditions. Fully resistant to rain and accidental dousings, it won't fog even with sudden temperature changes - leaving you free to concentrate on the work. This model meets JIS grade 4 specification for waterproofing. (This complies with international Electrotechnical Commission Standard, Class IPX4).
|
PL1 |
B1/B1C |
B20 |
B21 |
| Image |
Erect |
Erect |
Erect |
Erect |
| Magnification |
42x |
32x |
32x or 40x (opt.) |
30x |
| Resolving Power |
2” of arc |
3" |
n/a |
n/a |
| Field of View |
1° 10' (2.0 ft. @ 100 ft.) |
1° 20’ (2.3 ft. @ 100 ft.) |
1° 20’ (2.3 ft. @ 100 ft.) |
1° 20’ (2.3 ft. @ 100 ft.) |
| Minimum Focus |
6.6 ft. (2m) |
7.5 ft. (2.3m) |
1 ft. (0.3m) |
1 ft. (0.3m) |
| Stadia Ratio |
1:100 |
0.3:100 or 1:100 |
1:100 |
1:100 |
| Compensator — PL1 (split-image tubular vial); all others (wire-hung; magnetically damped) |
| Setting Accuracy |
n/a |
0.3" |
0.3" |
0.5" |
| Range |
n/a |
±10' |
± 15' |
± 15' |
| Leveling Accuracy (all models)—in 1.0 km (1 mile) of double-run leveling |
| Standard Deviation |
± 0.2mm / 001 ft. |
± 0.8mm / .003 ft. |
± 1.0mm / .004 ft. |
± 1.5mm / .006 ft. |
| w/ micrometer |
.001 in (0.1m) |
± 0.5mm / .002 ft. |
± 0.8mm / .003 ft. |
± 1.2mm / .005 ft. |
| Level Vial (all models) — circular |
| Sensitivity |
3.5' / 2mm |
10' / 2mm |
10' / 2mm |
10' / 2mm |
What's in the Box:
- Waterpass Sokkia B21
- Allumunium Tripod
- Rambu ukur / levelling staf
