Myron L 9PTK - Manual (Page 29)

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c. Press twice (3 times if in TDS mode). Temperature
compensation is now disabled (=0) for measurements in User
mode.
3. User Programmable Conductivity to TDS Ratio
This feature allows you to select a custom conductivity to TDS conversion
ratio within the range of 0.20-7.99 for User mode measurements.
To determine the conversion ratio for a custom solution of known
TDS ppm value, measure the solution conductivity at 25ºc with the
Ultrameter III and divide the ppm value by the µS value. For example,
a solution of known 75 ppm TDS and measured 100 µS conductivity at
25ºC would have a conversion ratio of 75/100 or 0.75. Enter the new
conversion ratio as follows:
a. While in User mode, press .
b. Press twice (to skip over tempco adjustment) and
“ratiO” will appear (see Figure 4).
c. Adjust with or key until new conversion ratio is
displayed.
d. Press twice (to skip over calibration adjustment) to
accept new conversion ratio. You are now ready to measure
samples with the new conductivity/TDS ratio.