2 calibrated refractometers, 2 different readings?

[dudemeister]

I have 2 refractometers that I have calibrated at the same time with the same calibration fluid. I have used separate pipettes for each and rinsed with rodi each time. One reads my system salinity at 1.027 (left one) as I expect and one reads 1.03 (right one). That's a big difference in my book. Any thoughts as to why this might be? More importantly- which do I trust?

 

[LQT]

Hmmm, I guess I'd go with the lower one to be able on the safe side.

 

[Maritimer]

What if it's the lower one that's off?

That's a pretty significant difference - maybe take a sample to your LFS to get a read on which refractometer can't be trusted?

~Bruce

 

[dudemeister]

both good suggestions!

 

[thefuz]

Bought one of these used a while back... been excellent so far! See if you can grab one on the forums.

https://www.amazon.com/Milwaukee-MA887-Refractometer-Temperature-Compensation/dp/B007Z4ITWU

 

[dudemeister]

You're 100% right Fuz- done. thx!