Paul,
            We have had a 'Gas Check' model B3 leak detector for about 6 years now. I seem to recall it cost around UK£1000 then but has easily paid for itself in time saved. If you get one, mark it well with your name as it is probably our most popular item for loaning out!   It was made by Ion Science Ltd, The Way, Fowlmere, Cambridgeshire, SG8 7QP, UK.  tel 01763 208503, fax 01763 208814

                                                                      Darren.


Darren Sleep
Stable Isotope Facility
ITE Merlewood
Grange-Over-Sands
Cumbria LA11 6JU
UK