Involvement:General (knows how to use it) - Ownership:1 week to 1 month
Allows to measure power consumption of any device pluggable into electric outlet. Based on that you can plan updates for a more power efficient device. It is possible to know the time measurement has been in progress, the current power being consumed, total amount of energy consumed, energy per hour, per day, per month
The plug is not the standard one - my world power adaptor had no compatible socket for it. No instruction in English. Smallest power reading is 0.01 kW, which transforms into 10W and there is no possibility to change the scale into the more detailed one. The energy consumed per hour, per month is calculated only after full period time (after a hour, day, month has ended).
Have bought this one because of convenience. For the same money could have bought much better device locally, only had to search better.
Avoid, because it is not cheap, most likely doesn't fit your socket, you will spend lot's of time figuring how it works (unless you know Chinese), and power reading will be very rough, especially for low power devices - computers, clocks, CFL table lamps, etc.
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