"Carolyn" wrote in message
...

I had a surveyor round the house as part of my Remortgage process. He used
his sensor on
all the downstairs internal walls and said that it showed him damp
readings in the front
lounge, dining room, and on the hallway walls.

My comment would be if he is a proper surveyor (member of RICS) he should
know this instrument is not supposed to be used like this, and if not, ask
for a proper surveyor to come and do the job.