So alone I would have probably not bought, but because it was in the package here, it is a practical addition. :-) What can the small spirit level? Well, of course you can use them to measure small things to some extent, for larger you should always use a longer level. It has laterally with the one it hangs a straight metal surface on the surface to be measured. And here also already appeared on the first problem. Looking at the level of the bottom, then she has there three support points and above are the 2 dragonflies. One might now think could the spirit level so use that is wrong but, alas! Because you could use it so, if you had a good look at the dragonfly. Unfortunately you have to use the spirit level with smooth lateral surface and here is to look at the dragonfly but a little more difficult. Another problem is that the dragonflies are very small, so you have to handle carefully and sensitively to bring it into the water. So for occasional small things, to use entirely for greater practical work where you have to measure a lot of rather poor handling. But what is really handy is the built-in laser. The can be easily by pressing a button on and off and can be seen very well even in bright daylight. The laser beam goes so around about half a meter around the corner. Whether and how to make use the wall bracket, each self is left. Qualitatively it is quite good, and the accompanying PINs are, at least so far, quite robust. I just hope the push in into the wall not even bursting the plastic and pushing me the pins in his finger. However, I would have felt more practical if the holder would have been installed one way where one houses / fixed these PINs, because they are always transported separately. Conclusion: As a substitute for a proper water balance is not really recommended for small Handwerklichkeiten yes. Since the laser is to use more, and here's the problem with the attachment. You do not want to constantly pierce new holes in his wall yes. If you, however, for two, and the other labeled at the laser beam, then you can use it perfectly. You need often a laser, then you can buy a better tripod and with other functions, for occasional use but quite handy and compact.
