Optical Instruments: Reflectorless Electronic Total Station ATS-120R Specifications Telescope Length 154mm Magnification 30X Image Erect Minimum focus 1.2m Additive constant 0 Objective aperture 45mm Resolving power 4” Field of view 1°20\' Reticle illumination Provided Angle measurement Method Absolute Code Horizontal angle panel diametrical detection Vertical angle panel diametrical detection Minimum Display 1” Accuracy 2” Compensator Type Single axis liquid tilt sensor Range ±3\' Accuracy 3” Display resolution According to angle display resolution Distance measurement Measuring range Average weather condition, visibility about 5km Reflectorless 0-200m Single prism 2000m Reflective sheet 700m Minimum display Accuracy measurement mode: 1mm Accuracy& Measuring time Prism Fine (2 + 2ppm x D) mm <1.2s Tracking (5 + 2ppm x D) mm <0.5s Reflective sheet (5 + 2ppm x D) mm <1.2s Reflectorless Fine (5 + 2ppm x D) mm <1.2s Tracking (10 + 2ppm x D) mm <0.5s Interface and Data management Display / Keyboard Graphic LCD, backlight, contrast adjustment / Alphanumeric keyboard / 25 keys with backlight Interface Serial RS-232C Optical plummet Image Erect Magnification 3X Minimum focus 0.5m General Level sensitivity Plate level:30”/2mm Circular level:8\'/2mm Power supply Rechargeable battery:BDC1800mAh,6v (Ni-MH Battery) Battery working time 8 hours Operating temperature -20 to +50°C Size 160x 150x 330mm Weight 5.2kg