The unit makes a solid impression and apparently attaches properly. The setting is a little complicated, but doable. In many situations, however, the device is only limited use. The display is very small. The label partly so tiny that even with healthy eyes has difficulty reading the font. If the unit is attached somewhere in a not very well-lit corner, you have to bring a flashlight and a magnifying glass, otherwise you do not know, whether one reads just kWh or watts or cost. Unlucky one when the socket is mounted low, then you have to lay flat on his stomach or at least Kneeling very deep in order to read the display can. Technically determined very good, ergonomically a bad design.
