What's the difference in this battery monitor?
 I'm shopping for a battery monitor for the camper and have decided on the Victron BMV 712 Smart. There are two options; 712 Black and 712 Grey. Reading the descriptions I can't figure out the difference (other than color and $20) between the two. Black runs right at $20 more at more than one on line vendor. Any of y'all run across this? What did you figure out? Many thanks for your input!
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TV-2012 Ram Cummins 3500 Limited SRW, Anderson Ultimate hitch
RV-2008 Elite Attitude 27AK
Toys- 1pr 2013 Polaris 550 ATVs, 2004 Tracker Targa 175 and various canoes and kayaks.
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