did you install the meter or was it already installed? Mine RO unit isn't spectrapure but looks identical. I got a 3rd party TDS meter (looks exactly the same as the one on yours) to hook up and the instructions told me to hook the "input" TDS leads inline with the output of the RO membrane. This can tell you if your membrane is going or not. I am currently reading a TDS of 3 out of my RO membrane.
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