RKE salinity probe calibration
 

I just got the SL2v2 module from DA and I experience a situation.
My refractometer is showing a difference of 10ppm between DigitalAquatic calibration solution and Aqua Craft calibrating solution.

Did you encounter a similar issue?
Should I buy a third calibrating solution?
DA solution is not accurate?
Aqua Craft is not accurate?

Thanks
Claud

I'd personally use the 35ppt Pinpoint Calibration Solution(American Marine Inc) and ditch the other two ASAP.

There will be a difference between solutions. The calibration solution that DA sends out, along with several other solutions out there, are not formulated to be read with a refractometer. There is a difference.

That being said, any solution that is marked with what it is will work for calibrating the probe.

This makes sense. Thank you Dave! The most reasonable answer I got for this issue.
I am wandering why DA doesn't tell this when you buy the probe. They let you :headwally: for a while.

A lot of us have been wondering very similar things!