Dranetz 626 plug-ins

There are many different models of 626 power disturbance monitors, from the vanilla 626, and from the 626A through 626G (as far as Mr. Google can tell
I'm interested to discover what the "G" model consists of. The front panel calls it "Graphics Universal Disturbance Analyzer". It looks like s plain 626 mainframe with a "AC Graphics Monitor Analyzer 626-PS-6030" plug-in.
I cannot find any detailed description of this plugin and what it does. "Graphics"? Hmm...
Anyone have experience with this module?
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