It's no good, it's the most useless thing I've ever bought. I tried it on a 1,800 W kettle and it showed a consumption of 1,150 W. Huge discrepancy, it's worthless.

Model GPM06. 4 stars for its price. It gives accurate measurements, so you can have a good idea of what a device consumes. I don't understand why the specifications and the manual mention a range of 2 - 3680 W. On a 0.5 W night light that I tested, it showed 0.5 W. What is mentioned about a "little iron" and Schuko socket is not true. There is no little iron and it accepts all Schuko sockets, etc., with or without a grounding hole. Perhaps the reviews on this point refer to an older model. The manual states that it has 2 LR44 batteries to maintain memory (total consumption and value in €). That's true, but it doesn't display readings when unplugged.

Very easy to use, by default was set to watts when I plugged it in, tells me straight away how many watts my little oil heater is consuming :)

Would recommend!

Different results from others.
I tried it with the same device at the same time for the exact same period EXACTLY three times and it showed three different readings with a deviation of up to 3 kWh.

It does its job perfectly fine. I recommend it. Its use was for all power-consuming devices, such as a coffee maker at 1100 watts, a hairdryer at 1700 watts, and a whole computer in normal use ranging from 45 to a maximum of 115 watts, including a 27.5-inch monitor. It does not harm computers even if they have an 850-watt power supply. Unless we are in a rendering situation, there it can reach up to 250 or even 300 watts depending on the graphics card. I highly recommend it, it is value for money and compared to expensive multimeters, the deviation is minimal

For the money, very expensive in measurements, I had a bunch of devices that burn 40w in standby altogether in the house that I didn't even know they burn so much because in 24/7 they are 29 kilowatt-hours per month without producing anything, just sitting in standby in the socket, only this iron and you need to have a multi-socket with a hole to connect some devices that do not have such a hole in the plug (I show in the photo the hole that the plug should have)

Very useful and easy to use, purchased about a year ago. I used it for my thesis project for measuring the energy consumption of a PC, as I wanted to see real-time consumption.

It does not have enough secondary features compared to more expensive competitors, but it has all the basics for a reliable consumption control. It is easy to use and, most importantly, I have cross-checked it and it is 99.99% reliable in its measurements

It has everything I wanted... instant voltage measurement in volts, instant power consumption in watts, total power consumption in kilowatts, adjustable kilowatt-hour rate, and consumption indication in Euros. The only downside is the grounding plug that doesn't allow you to plug it into an outlet without a grounding hole.