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Are you looking for a hand-held meter or a monitor that hooks up to the out line on your R/O and monitors the conductivity of the water coming out of the R/O?
In either case I suggest www.spectrapure.com. They sell both products, and have a new hand held meter by HM Digital (COM-100) that is a very good deal at teh price they are asking. If you are interested in an all-in-one pH/EC meter, the only on on the market in a hand-held meter is the Hanna Instruments Combo Meter. A search for that on google will get several sources for you. A seller on AB (Labtek) posts them occasionally.