Telescope Image Erect image Magnification 30x Effective aperture 45mm Resolving Power 3” Field of view 130 Minimum 1.4m Stadia Ratio 100 Stadia Constant 0 Sight Distance Precision 0.40%L Tube Length 157mm Angle Measurement Angle Measurement Mode Photoelectric detection by incremental decoder Dia of circle (vertical, horizontal) 79mm Mode detection Horizontal angle: dual; Vertical angle: (single) Measurement unit 360o /400gon/6400mil (available to choose) Levelling vial Sensitivity of plate vial (/2mm) 30” /2mm Sensitivity of circular vial 8’ /2m Vertical compensatory System Liquid condenser Working range ±3” Precision 1” Optical Plummet Image Erect Image Magnification 3x Focusing range 0.5~µ Field of view 5o Display Type LCD, Double line, line segment Data input/output Data interface RS-232C On-board battery Power source Rechargeable Ni-H battery Voltage DC6V Operating time 8h Working environment Working temperature -20o~+45o Instrument Dimension / Weight 160x150x330mm / 5.2kg