Hi All! I have one question that I hope that You can find the answer for: How to non-destructively find out the composition of a finished concrete/brick wall? For an example, we are making different sorts of stainless steel terraces, stairways, fences etc. that frequently need to be fixed to the already finished walls or stairways made of conrete and/or bricks (both hollow and solid form). The problem is that we never know what is hidden beneath the mortar and often you realize the right composition of wall is when you drill the holes for fixing the stairway, just to discover that nothing is there except the thin layer of mortar and rubble behind it. Is there some sort of device that could tell us the right density (or other information) that could be used to see the exact composition of the wall? Ultrasound does here little help as it bounes of the air hidden below ceramic tiles in places that has no glue and it's rather inacurate device to "see" through the wall. Any sort of pointing to manufacturers, literature or information would be more than welcome. Thank you!