This Robotic comes with a 1″ angle accuracy. It has a reflectorless range of 1000 meters. Combined with the right field software you can get your surveying work done in no time! Since a robotic automatically finds a tracks your prism, it eliminates the need for a seconds person to do your stakeouts. With a Robotic or manual Total station you can generally get around a 1 to 2 millimeter accuracy. However this of course depends on the environments and the quality of the total station itself and its components. The experience of the user also plays a big role in the overal accuracy since properly working with a total station is a lot more complex than with a gnss receiver. A wrong setup from the start can have create inaccurate measurements throughout the whole survey.