P3 International P4330 PS-10 Kill-A-Watt 10-Outlet Surge Protector for $54.99 shipped after coupon code CEWK956. Here is a screenshot for your reference. Simply connect appliances into the Kill A Watt PS-10, and it will assess how efficient they are. It also comes with built-in surge protection and no load detection. As a comparison, The Home Depot currently has it for about $99.