We have two different products in our long distance measurement range of products – the range of API laser trackers as well as the 3D Disto product from Leica Geosystems.
Laser trackers measure X,Y, Z coordinates of points in space and distances between points up to 80 metres away from the measuring instrument at incredibly high accuracy – less than 0.4 mm at this distance, using laser interferometers and time of flight systems.
The 3D Disto is a different instrument in that it is using laser beams to determine the distance from the instrument to a laser point on a surface or wall with millimetre accuracy over a 50 metre range.