-Unzuverlässige Buttons on / off / zero: The caliper is almost always switched on when I take it out of the box. The key to zero is extremely difficult to obtain and often depends. In general, the caliper adjusted often.
-The Depth gauge is completely useless, because very shaky and unstable. To ensure that no meaningful measurement of irgenwas is possible.
The accuracy I have not checked, but should be sufficient.
If you even want to remeasure a screw from time to time, the caliper is ok. For everything else, I think you should look for something higher quality.