Geomaster/China manufactures professsional Surveying Instrument-Automatic Level, Digital Level, Optical Level, Transit Level... Optical Level DS3 SeriesModelDS3-DDS3-ZDImage of TelescopeReverseErectMagnification32×32×Standard Deviation for1km Double-Run Leveling ±3.0mm ±3.0mmCompensatorwithoutwithoutObjective Aperture42mm42mmShortest Focusing Distance2m2mField of View1°26'1°26'Multiplication ...