Random generator

This was my first line tester I bought.
And I thought to myself instead of 20 euros a cheap part,
I prefer Bosch, you have some neat ...
This was not so!
Having despaired in the old house of my parents
(According to machine the pipes were laid in a zigzag, or
ran here and there into nothing), I then in a
New tested.
Sometimes I could not even determine which side
Outlets were connected.
The device shows almost always a bar or even just
no!
Sometimes live wires were displayed,
where are definitely not.
with a metal pipe, I also tested.
In this it was always full swing when
came out almost from the sensor area and right in the
Middle green. So you have faith exactly between
to drill two lines, in reality you drilled
exactly through the middle ...
Only after I've looked at here recessions,
and realize that this is probably not a defect but
Intention!
Since you are a noname from the hardware store for 20
at least as good advice, or better!