You can buy an IFc unit fairly inexpensively:
http://www.healiohealth.com/tek9.asp...cific=jnnrmmm8
I have one. (there are 3 other types on that site)
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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