I don't know how the readers work, does the reader breach through the DPM or is the reading from above?
how the readers work
Not very well, is how they work.
What sort of construction is the building - Particularly the walls around the concrete floor room?
What is the survey for?
@NotThamesWater started
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I don't know how the readers work, does the reader breach through the DPM or is the reading from above?