Good cheap little meters to add to breaker panels or circuits to see what's going on. Don't need to have wifi or a smartphone or such like the fancier monitoring systems, so you can install one on the subpanel out in the shed, for example, to see what it does over time. Can't measure 220vac split phase unless you do two of them, but great for 120vac circuits, or a 220 balanced load. Had one out of 5 or 6 of them I've used that just died after 10 minutes of operating, but all the rest have worked for months or even several years so far.
Rating: [4 of 5 Stars!]