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Best way is to get it done profesionally, but you can do it yourself with the right type of meter. The problem is most of the cheap meters have two pins which you have to probe the surface with.
This type are pretty useless for a motorhome as the wallboard has a plasticised finish, so to get a readig you have to puncture the surface every few inches leaving holes.
You need a non invasive meter like the one below.
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...If your budget would stretch to £20K I do know of a fantastic buy before it goes on ebay.
That looks a clever piece of kit and what's £49 compared to the cost of rebuilding a MH.
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Dont get confused by damp meter readings. Use the meter on an obviously dry piece of wood inside the MH...inside of a wardrobe door or cabinet, note the reading, some meters will read in percentages, some bars, some just a band going up a scale,.....whatever yours was on the dry bit of wood, use as your benchmark.
Say it was 20, and most of the MH reads, 25, but some bits (around windows, in corners, floor near door etc) read 40-45...then you may have a problem.
Mine was done at Newark by a pro company, cost me £35...worth every penny as you get a report. Myself, I would use a tester, then if i fell in love with a van...get the pro's in, their report will either make you walk away, get the dealer to do repairs, or get a large discount (if you are a gambler).
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Non contact one good.
The pin type gives a high reading on my ceiling as the inner skin is aluminium, much the same as the plastic coating error but the other way round. This is because they don't actually measure moisture directly, but electrical conductivity.