I'm glad I read the questions and reviews.  I like that this one is a 2% meter while others are 3% and not temp compensated.  Price is great and it arrived swiftly.  I checked my RO, which I had just replaced the membrane and all filters.  Water is 19PPM, with tap water at 751PPM and street (before water softener) is 647PPM.  Since the city water source is the Colorado River, I'm not surprised at the elevated TDS, and darn glad I have an RO.  Interesting that the softener adds TDS.  I'll fiddle a skosh more to understand that.