Sap Refractometer w/ Temp Compensation down to 32 deg F?

[cray54]

I am trying to find an automatic temperature compensation (ATC) refractometer that has a functional temperature range down to 32 deg F (or at least has a range that covers normal sap flow temperatures). I have only been able to find units down to ~50 deg F.

Does anyone use a 0-10 deg Brix automatic temperature compensation refractometer with good results below the specified temperature range?

I found one other thread from 2 years ago with this question but no answers yet:
http://mapletrader.com/community/showthread.php?14212-refractometer-temp-compensation

Thanks,
Chris