Mine reads around 25TDS. Like H4N, my water pressure is the pits, and my tap is high TDS. He has a pressure booster and I don't. The lower your water pressure, the more TDS will read. If you have regular water pressure or high water pressure, the lower your TDS will be.
As bad as this sounds, I love it! My animals do well with the RO. Without it, I'm always having some kind of problem going on.
Two best investments I've ever made in this hobby are my RO unit, and my Alita 60 air pump.