The BlueLine PowerCost monitor (same as the Black and Decker version) both have sensors that, in addition to reading digital meters, can read the black line on

The BlueLine PowerCost monitor (same as the Black and Decker version) both have sensors that, in addition to reading digital meters, can read the black line on the analog meters. There's no reason that WattVision couldn't do exactly the same thing. It's primitive, to be sure, but it works.