an easy-to-build device that accurately measures the power draw of electrical appliances. the EnerJar was the winner of the Greener Gadgets competition.

[link: enerjar.net & core77.com]

see also saverclip & vision energy sculpture & energy joule & energy monitoring device & eco-visualization & patterns of energy use & power-aware cord & standby visualization & power socket bar chart & wattson energy display.