Presumably you’re talking about these or similar –
https://leica-geosystems.com/en-gb/products/total-stations
They’re very well engineered pieces of equipment that use a laser to measure points from one another, and using the software, you can use the construction drawings to show and subsequently plot lines in physical space allowing you to mark out walls, footings, trenches and much more.
If you know The level of a slab for instance, you can measure it to know if it’s to high or too low or if a wall is tiliting even a fraction of a millimetre from top to bottom.
It does this by using predetermined points called datems that you know the location of and will then triangulate its position to know where it is, and subsequently what it is looking at.
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