I just purchased one as well, although I must say it looks a little different than the one in your photo. The one I have is more rectangular and in addition to the power button it has a 'Read' button. Might be a newer model.
My tap water was somewhere over 200 and I tested a sample of distilled water I had at 003. Don't have a RODI yet so can't comment on that part of your question.
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