the y-axis of my diagram uses small numbers like 0,005. I don't want to use a multiplier like 10^-3 which appears by default. If I remove it with
scaled x ticks = false,
x tick label style={/pgf/number format/fixed},
the tick labels are not accurate enough and show ony 0 or 0,1:

Code used:
\begin{tikzpicture}
\begin{axis}[%
scaled x ticks = false,
x tick label style={/pgf/number format/fixed},
scaled y ticks = false,
scale only axis,
width=6cm,
height=5cm,
xmin=0, xmax=30000,
ymin=-0.001, ymax=0.006,
ymajorgrids,
axis on top]
How can i get this right?

{}button above the text field) to get everything indented. Also, it's always best to provide a complete, compilable, yet minimal example, a minimal working example (MWE). – Torbjørn T. Nov 23 '11 at 15:23