Myron L 9PTK - Manual (Page 71)

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The LSI Calculator allows you to select either ppm or grains of
hardness units.
The hardness unit conversion is based on the following equivalency:
17.1 ppm (mg/L) = 1 grain
XXv. sOFtware versiOn
Contact the Myron L Company to see if a software upgrade is available.
1. Press any parameter key.
2. Press key until three numbers are displayed as shown
in Figure 35.
3. Press any parameter key; instrument will time out in ~15
seconds.