I have a weird bit of damp on my wall. I have an injected DPC and the damp section seems to sit above the DPC. I bought a damp meter and its shows that the wall is perfectly dry underneath the damp patch but the patch itself is very damp. There are no water pipes anywhere near the patch and the gutter above is not leaking or dripping down. One damp guy said perhaps the sill wasn't dripping properly so I had a drip put on the sill. It made no difference. Does anyone have any ideas!!