Several about but not cheap, example
http://www.passionforpaint.co.uk/MoistureMetersGlassFibre.htm
What is your problem ?
Get a smoke machine stick it inside seal the door and any vents and fill it with smoke you'll see the smoke escape![]()
That would cure the leakWould that be with petrol![]()
Hose pipe. Sit someone inside. Start dowsing low down, and slowly work your wayup. At some point you *may* find where its getting in.
Have you checked them rails? I'd be aiming a hose pipe at them, it's more likely to be leaking at a thru hull/deck point than anywhere else.
With any thru hull/deck fitting we plaster it with marine grade sikaflex like it's going out of style and then tidy up later when it's cured. It might be a sod to remove later but it's better than a leak.
can you not use the drain dye in a watering can
https://www.bes.co.uk/drain-tracing-dye-yellow-200-g?gclid=CI6avK_jrdICFYUV0wodvuAKJg
that will not work though, the hole could be feet away from the internal leak and i need to search it over square foot at a time.
Why wont it. If you are sparying water 3feet away from where the drip is showing inside then thats where its getting in