See what's going on...pull up a chair? The discussion is how to interpret a voltmeter not a Trimetric.
A lot of folks are intimidated by trying to learn how to use voltmeter-ammeter- amp hour meter. Never mind the cost and installation labor.
This is aimed at lazy folks like me, who do not want to jump out of bed at 11:00 freezing PM to see if everything is alright. Yeah right. Freeze my A$S off. A glance at a bedside 5 digit panel meter will reveal all there is to know at that hour. The daylight grade amp hour panel meter is for daylight use.
Such a voltmeter ends 2:00 AM honey-where's-the-flashlight dramas.
