For power outlets it is the ideal size. It is good, of course, to remove the metal hook it has on the back, especially if you don't have it constantly on your belt.

HOWEVER:

It is not 100% accurate. Even slightly, slightly, you see that it "steals" in measurements, something that is evident if you measure a surface from both sides, either vertically or horizontally.
I would only give 1 star because the deviation is not large, but because it is a well-known company supposedly one of the best globally, such errors are not allowed.

Practical for leveling electrical switches. It has decent accuracy. And it has a strong magnet. Flawless.

UPDATE: within 2 weeks, without dropping or hitting it even once, one bubble level (actually both) has broken and one shows the correct level while the other does not (for example, it may show correctly from one side, but shows something else from the other side). Also, the metal part (where the magnet is) moves slightly from the plastic when you apply force to push (what you are trying to level), so it doesn't allow you to level properly if you apply force with the level. Therefore, it is made of cheap plastic. If it breaks so quickly, then it's a toy, not a tool.

And other Stanley levels, based on my experience, break and the bubble levels don't show correctly after a while. Garbage... If you can't trust the level, then what's the point. I simply won't buy anything from Stanley again, they don't have quality.

It does its job, fits everywhere, has a magnet on the bottom, and has a hook on the back.

I placed the two-euro coin in the photos for scale.

I have bought this specific level before and it is very reliable in terms of size and price. My first one broke after falling from three floors, only one glass piece cracked. Overall, very durable.