42 of 44 people found the following review helpful
Useful device but no memory,
This review is from: Plug-In Power and Energy Monitor (DIY & Tools)
A useful meter for measuring electricity use on a device basis. Its interesting to compare different heaters, computers there can be significant differences between different models. For example a 14" Sony ~35 watts while a 17" Dell laptop is ~65 watts
Although if you unplug the monitor you lose the total kwh so be sure to plug it into an easily visible socket, there are more expensive meters which have a small watch battery to store the total kwh.