PDH:
I've installed numerous E-Mon's over the years; can't say much 'bad' things about them. All were used for revenue purposes. Read the documentation at E-Mon as to accuracy. Most were manually 'read' for billilg purposes, later ones were installed with modem interconnect to a Windows based PC.
Also, Square D has a similar offering. And another system I installed a few times was 'Power Logics'.
