Electrical cable in the wall (drilling)

Ok, a power meter like this is also fine, but you should be careful that the device you buy is not too cheap. Because if an error does occur, it can get really expensive, especially with old walls that are still coated with reed. If a cable gets damaged and you then get a smoldering fire, mmh.

At this point, saving money is the wrong approach. I also bought such a device and did not look at the money. I also share it with my family and friends. They then have other devices that I can also use.