An Augmented Reality -based system for the purpose of at least one of surveying and inspecting an object, in particular further at least one of fitting, adjusting, and building the object, said system comprising ▪ a mobile sensor configured for measuring an object, for being manoeuvrable, and for being used hand-held, ▪ an AR-device comprising □ a camera configured for capturing an environment of the AR-device, and □ a display configured for providing · a real view of the environment, and · overlays onto the real view according to AR-data, said AR-data being spatially associated with the object, and ▪ a coordinate measuring instrument configured for determining a position of the mobile sensor and a position of the AR-device, ▪ a computer configured for □ reading and controlling the camera, □ processing a video stream captured by the camera of the AR-device □ providing a reciprocal data connection among the AR-device and the coordinate measuring instrument, □ providing the AR-data and, for each of the mobile sensor, the coordinate measuring instrument, and the object, at least one corresponding identification feature, □ establishing a referenced status of the AR-device relative to each of the mobile sensor, the coordinate measuring instrument, and the object by, in each case, · identifying a respective identification feature captured by the camera, · determining a pose of the AR-device relative to the respective identification feature, and □ generating the overlays in the referenced status based on the pose of the AR-device relative to at least one of the mobile sensor, the coordinate measuring instrument, and the object. ▪ a mobile sensor configured for measuring an object, for being manoeuvrable, and for being used hand-held, ▪ an AR-device comprising □ a camera configured for capturing an environment of the AR-device, and □ a display configured for providing · a real view of the environment, and · overlays onto the real view according to AR-data, said AR-data being spatially associated with the object, and □ a camera configured for capturing an environment of the AR-device, and □ a display configured for providing · a real view of the environment, and · overlays onto the real view according to AR-data, said AR-data being spatially associated with the object, and · a real view of the environment, and · overlays onto the real view according to AR-data, said AR-data being spatially associated with the object, and ▪ a coordinate measuring instrument configured for determining a position of the mobile sensor and a position of the AR-device, ▪ a computer configured for □ reading and controlling the camera, □ processing a video stream captured by the camera of the AR-device □ providing a reciprocal data connection among the AR-device and the coordinate measuring instrument, □ providing the AR-data and, for each of the mobile sensor, the coordinate measuring instrument, and the object, at least one corresponding identification feature, □ establishing a referenced status of the AR-device relative to each of the mobile sensor, the coordinate measuring instrument, and the object by, in each case, · identifying a respective identification feature captured by the camera, · determining a pose of the AR-device relative to the respective identification feature, and □ generating the overlays in the referenced status based on the pose of the AR-device relative to at least one of the mobile sensor, the coordinate measuring instrument, and the object. □ reading and controlling the camera, □ processing a video stream captured by the camera of the AR-device □ providing a reciprocal data connection among the AR-device and the coordinate measuring instrument, □ providing the AR-data and, for each of the mobile sensor, the coordinate measuring instrument, and the object, at least one corresponding identification feature, □ establishing a referenced status of the AR-device relative to each of the mobile sensor, the coordinate measuring instrument, and the object by, in each case, · identifying a respective identification feature captured by the camera, · determining a pose of the AR-device relative to the respective identification feature, and · identifying a respective identification feature captured by the camera, · determining a pose of the AR-device relative to the respective identification feature, and □ generating the overlays in the referenced status based on the pose of the AR-device relative to at least one of the mobile sensor, the coordinate measuring instrument, and the object.