Convertion between milliSiemens (mS) and ppm?

Instrumentation Analytical
1

Convert to microSiemens by multiplying by 1000. Then multiply by 0.7:

ex. Your reading is 2.14 milliSiemens (x 1000 = 2140 microSiemens). 2140 x 0.7 = 1498 ppm.

Or simply multiply by 700. (2.14 x 700 = 1498)