Yes it has a built in TDS meter but it has not worked from day 1. After my resevoir is full and the unit is no longer making water the TDS meter eventually climbs up to 50PP within a couple of hours and stays that way even after it does it's 30sec flush. Which is why i'm always unsure on the cartridges or membrane. The valve that the TDS meter plugs in to used to be before the DI canister. I have since moved that valve so it is between the outflow of the DI canister and my resevoir. The DI should be the final stage that filtered water flows from, correct?
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