Instrument features: full Chinese display, digital / letter keys, field input more convenient; large capacity memory: 24000 coordinates of a known point, 24,000 data collection observation points; 10 hours long battery operating time; waterproof and dustproof grade up to IP54 level; Angle measurement accuracy: ± 2 "/ 5", the absolute angle measurement method without zero test; Ranging Accuracy: ± (2mm +2 ppm * D), measuring range: 2km / single prism, high-speed distance: precision measuring 1.2 seconds , rough measurement 0.7 seconds, 0.4 seconds track; rich application measurement procedures, such as RoadRunner software, MLM, REM, area calculation, offset measurement, the new point is set, coordinate measurement, Coordinate, etc., greatly facilitate the engineering application. Objective lens aperture: 45mm (EDM: 50mm) Magnification: 30 × Erect Field: 1 ° 30 'Resolution: 3 "Minimum sight distance: 1.3m distance measurement single prism: 2000m prism: 2700m Accuracy: ± ( 2mm +2 ppmD) mse accurate measurement time mode: about 1.2 seconds Coarse measurement mode: about 0.7 seconds trace mode: about 0.4 seconds atmospheric correction: There is Angle measurement accuracy: 2 "Angle ways: absolute method of reading Sampling Method: H : the diameter V: Unilateral Minimum reading: 1 "/ 5" Display Monitor: double-sided tilt compensator way: liquid compensator Compensation range: ± 3 'Optical plummet Magnification: 3 × Just focusing range: 0.5 - ∞ Field Angle: 5 ° durability Waterproof and dustproof: IP54 Working temperature: -20 ℃ ~ +50 ℃ Power supply built-in battery: TBB-2, voltage 7.2V, capacity 2300mAh (Ni-MH) battery charger: TBC-2 consecutive Ranging goniometer time: 10 hours of continuous angle measurement time: 45 hours Other instruments foot grave: 3 × Just Weight: 0.5-∞ Communication Interface: Standard RS-232C external power jack: Yes Memory Capacity: data acquisition 24,000 points, 24,000 points coordinates of built-in functions: data collection, stakeout, the new point is set, SD / VD / HD, N / E / Z, HL, HR, / V, V%, H fold angle measurement, REM, horizontal angle measurements, HO horizontal settings, horizontal hold, collimation error correction, marking piles, the station set, 90 ° Beeper, RoadRunner