1 ms = 500 ppm meters: 1.1413 ms = 570.65 ppm
1 ms = 666 ppm: 1.1413 ms = 760.1058 ppm
1 ms = 700 ppm: 1.1413 ms = 798.91 ppm
Some meters like the shiny Bluelab meters don't need to be calibrated, but it's still good to check that the CE is still reading correctly. With these meters an incorrect reading is generally due to low batteries or cleaning the probe may CE.
Pour as much CE standard in what is necessary to cover the electrodes.