>Yea, we have a Siemens meter on the BBC transmitters. Gets a lot of questions. :) :) John @ VOA / Delano - water conductivity meter I assume. I once found the locals draining the transmitter water into drinking water bottles. "It is pure, deionised, yes?" Not advisable, though not as bad as the Africans about to do a fry-up in transformer oil. Clive