The good news from our test: All the devices tested are able to correctly determine the power and power consumption of connected loads. The overall package of the X4-Life model is impressive with its clear operation and many displayed values. A money-saving tip is the plug from mail-order company Pearl: The Revolt plug is similarly good and only dispenses with some display values...

How much does it cost to leave the TV permanently on standby? How much electricity does the old refrigerator in the party room consume? And does the washing machine not only throw laundry out the window, but also money? In times of rising electricity prices, many people ask themselves such questions...