single prism 5.0km reflectorless 350m accuracy with reflector: 2mm+2ppm; without reflector: 3mm+5ppm reading max: 99999999.999 min: 1mm measuring time fine: 1s; tracking: 0.5s atmospheric refraction & earth curvation correction manual input, auto correction prism constant manual input, auto correction ANGLE MEASUREMENT measuring method absolute encoding diameter of raster disk 79mm minimum reading 1”/5” selectable acuracy 2” 5” detection method horizontal: dual vertical: dual TELESCOPE image erect tube length 154mm effective aperture Telescope: 45mm; EDM: 50mm magnification 30X field of view 1°30’ resolviong power 3” min. focusing distance 1m AUTO VERTICAL COMPENSATOR system 2-axis liquid-electric working range ±3’ accuracy 1” LEVEL plate vial 30”/2mm circular vial 8’/2mm Data Storage Internal memory 64M OPTICAL PLUMMET image erect magnification 3X focusing range 0.5m ~ ∞ field of view 5° OTHER display type 2 sides, alphanumeric keyboard laser plummet optional ON-BOARD BATTERY type rechargeable Ni-H battery voltage 6V operating time 8 hours DIMENSION & WEIGHT dimension 200 X 190 X 350mm weight 6.0kg