Looking for a "real power meter", the "produced" energy connected "producer" indicates (unfortunately that does not make any gauge, as I discovered with several failed attempts!), I am on the manufacturers of mobile small PV systems hear about this device ... what can I say: plug, electricity tariff set (Note: these are in fact Euro and not Euro cents with decimal place) Connect and consumers or producers, and are pleased that the display comfortably, the energy / displays time :-) I have previously already spent significantly more money for much less function ...