Hobby-grade digital refractometers more accurate than MA877/HI 96822?

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Anything in the approximate price range that may sport a tighter accuracy? +-2 PPT or 0.002SG can actually be a noticeable swing (potentially up to 3-4PPT/0.004SG if unlucky) when keeping a mixed reef.

 

I have an MA877 from about a year and a half ago... but I'm finding I just have more consistent results (i,e, significantly less cases of livestock stress following water changes) when getting the final mixing adjustments dialed in using my non-digital DD handheld.

 

It's not that the DD unit is "all that"... I WANT to like the MA, largely because my lab technique has been described charitably by some as "utterly sucktacular".

 

I was also going to muse a bit about maybe switching over to using a properly ranged conductivity tester, but came across this: http://www.advancedaquarist.com/2008/12/review1