How does the operator measure the thickness of a wall plus all the layers of plaster added over the years?

By scanning each room and shifting the tripods between rooms and scanning these in turn, a full plan of each room (and it’s location in relation to the other rooms) will reveal itself – at this point you will clearly be able to see and identify wall thicknesses and even tell if a wall is tapered (without using a drill!) We sadly can’t tell if there are many layers of plaster (it’s not x ray unfortunately) but we would have a good idea of how many layers there are simply by looking at the thickness of the wall. If the device is placed in the middle of a room, the angle of incidence when pointing at a corner could be greater than 45 degrees. You say that the device will tolerate a few degrees departure presumably from normal in the optical sense, much as my sonic tape, so I can not see the device actually working out the wall orientation in a corner.

Forgive my lack of surveying knowledge (I’m a software developer), but I’ll try to answer this. The device initially takes a start ... more.

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