Peter writes: > To convert Ohm to Siemens 1S = 1/Ohm 1 mho is also equal to 1/ohms. Two names for the same thing. But in a wire or a curcuit it's refered to as conductance, rather than condutivity. >If Ohmmeters are that inexpensive and easy to use and these formulas are >right, this sounds like an accesible solution. Then again, it sounds too >simple to be right, so I might be missing something ? The problem as I understand it is that the probes must be a SPECIFIC distance apart. No variation. This apparently justifies the great expense. I think someone who knows the scientific details of all this could come up with a spacer to keep them the right distance apart and then work up a chart. Talk to an electrical engineer. Bob Dixon ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!