F420-4T is a desktop style and used for autolevel,theodolites and total station.
*Main Technical Parameters:<o:p>
Tube length: 520mm<o:p>
Tube focus: 420mm<o:p>
Tube Aperture: 55mm<o:p>
Resolution: 3"<o:p>
Angle of field of view: 10°20<o:p>
Accuracy(Reticle's division value): 30"<o:p>
Magnification: 5.7~7X<o:p>
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The shortest target of the level tube: 2m<o:p>
The far target: ∞ <o:p>
Tubes position: <o:p>
Horizontal(0°,20°),elevation(30°) and depresion(30°)
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Level accuracy: <o:p>
Round level(On the foundation of the front column): 8"/2mm, <o:p>
long level(On the front/back horizontal tube):20'
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Lifting range of the lifting platform: ≥320mm<o:p>
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Power supply for tube: 4.5~6V,2.1W<o:p>
Switch power: 1~10A<o:p>
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Lighting source: cold light (with adjustable intensity), green <o:p>
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Shipment package: 3wooden cases,140kgs,0.5cbm