Help! Should I trust my old swing arm or new refractometer?

[archx]

thanks to all. ...must be the pinpoint fluid I'm using (it was in a plain white box from MD). I'll look for the 35ppt solution

[Sexy Shrimp]

If your SG is slightly high look at is as a cost saving in salt

 

I'd trust a properly calibrated refrac over a swing arm. But as filefish says - if the refrac is calibrated with RO, the swing might be more accurate. You could always try soaking it in vinegar and retesting just to check

 

If you dont get any resolution you could always split the difference and try and keep the SG there. Your corals and fish can get used to a different SG over time, its instability they dont like...