Calabrating a Milwaukee pH Monitor?

[pennyguy23]

How do I calibrate a Milwaukee SMS120 pH Monitor I just got it and it says I need 4.0 and It came with 7.01 calabration. Do I need to order the 4.0?

 

[jgoodrich71]

You actually need a 7.0 and something higher (10.0)

You zero it with the 7.0, then adjust the slope with the 10.0

That is for manual calibration. I have never used a Milwakee, but I know a lot of pH meters use 4.0 for an autocalibration.

4.0 and 7.0 would be used for freshwater manual cal.
But for SW, the most acurate way is to use the 7 and 10.

 

[pennyguy23]

Thank you.