Are you asking, does TDS level affect CYA reading? If so, the answer is no.

Code:
                 FC  T/CC CH   CYA    TA   PH   PHO
7/12-AM Store   1.0  1.0  260   60    80  7.6   100
7/12-AM Home    2.0  0.5  410  115   130  7.5     0
How is the pool store testing? Those numbers don't look like computer read numbers, but they are as inaccurate as computer testing.