Telescope: Magnification: 30 x
Clear objective diameter: 40 mm
Focusing: 1.7 m/5.6 ft to infinity
Field of view: 1°30’/1.66 gon
2.7 m at 100 m
Compensator
Level: Circular level sensitivity: 6’/2 mm
Electronic level resolution: 2"
Instrument Ports
Instrument Dimensions
Weight: Instrument: 4.8 - 5.5 kg
Tribrach: 0.8 kg
Internal battery GEB221: 0.2 kg
Laser plummet: Type: Visible red laser class 2
Location: In standing axis of instrument
Accuracy: Deviation from plumbline:
1.5 mm at 1.5 m instrument height
Diameter of laser point: 2.5 mm at 1.5 m instrument height
Drives: Type: Endless horizontal and vertical drives
Motorisation: Maximum rotating speed: 50 gon/s
Power External supply voltage: Nominal voltage 12.8 V DC, Range 11.5 V-13.5 V
Internal battery: Type: Li-Ion
Voltage: 7.4 V
Capacity: GEB221: 4.4 Ah
Typical operating time: 5 - 8 h
External battery: Type: NiMH
Voltage: 12 V
Capacity: GEB221: GEB171: 8.0 Ah
Typical operating time: 18 - 24 h
Environmental specifications
Temperature 
Protection against water, dust and sand 
Humidity
Reflectors 
Electronic Guide Light EGL: Working range: 5 - 150 m
Positioning accuracy: 5 cm at 100 m
Automatic corrections
The following automatic corrections are made:
• Line of sight error • Vertical index error
• Tilting axis error • Standing axis tilt
• Earth curvature • Refraction
• Circle eccentricity • ATR zero point error
• Compensator index error