£8.99 Buy it now

Too many people chasing poorly constructed campers (usually made in UK) buy a 'bargain' only to find they've inherited a rotten camper.
Usually used to test firewood stacked outside they will give you and seller an instant result by pushing the probes lightly into both internal and external wooden structure,
as an example you may well find a moisture reading of some sort in bed area as a result of respiration, and again beside hob and where a kettle boils condensation,
anywhere else like washroom or possibly water filler point is cause for concern/discount