There is no definitive answer to this question as it depends very much on the concrete quality and the amount of steel present. Using the Pundit...

There is no definitive answer to this question as it depends very much on the concrete quality and the amount of steel present. Using the Pundit PD8000 instrument with the Far Field macro selected (low frequency and high transmission voltage), depths of up to 2m have been achieved. However, it is also possible that depth penetration may be limited to about 1m if the concrete quality is not good, or if there is a lot of steel present in the structure.