Found this in another thread.... is it saying that a 442 reading of 1400 or an NaCl reading of 750 means the PPM is at 1500? If so, please reply quickly or the herb committee will charge me with murder!!!

Electrical Conductivity (EC) Parts Per Million (PPM)
miliSiemens (mS) microSiemens (mS) NaCl Conversion 442 Conversion
1.0 1000 = 500 ppm 700 ppm
1.5 1500 = 750 ppm 1050 ppm
2.0 2000 = 1000 ppm 1400 ppm
2.5 2500 = 1250 ppm 1750 ppm
3.0 3000 = 1500 ppm 2100 ppm