In article ,
John Greenwood wrote:
Yes thanks this helps a lot, now I just need to know which type of meter
to buy, is this one suitable:

It would, although is quite expensive if all you need is a basic DVM.
Maplin sell ones which will do this job for only a few pounds.

Also, if you go to eBay 'Test Equipment' you'll find a new DVM on offer
that also does temperature, which is very useful for balancing central
heating or checking ovens etc. They sell for about 15 quid, and IMHO are
good value.

--
*The more people I meet, the more I like my dog.

Dave Plowman London SW 12
RIP Acorn