Mathematica: How to change units od axis

[brunoxy1]

Hello,

I would like to know, how can I change units showed in axis. I would like to change those relative units (20000, 40000...) to μm. The conversional relation is 50 = 1μm, so instead 20000, 40000 i would like to have 400μm, 800μm. I enclose picture where it should be more clear what I am trying to achieve.

Thank you very much for your help

 

[djelovin]

You can set thick manually:
e.g.

Plot3D[Sin[(x y)/10], {x, 0, 100 Pi}, {y, 0, 100 Pi}, 
Ticks -> {{{0, "o"}, {100, "1m"}, {200, "2m"}, {300, "3m"}}, 
       {0, 100 Pi/2, 100 Pi}, {{-1, "A"}, {0, "B"}, {1, "C"}}}]

 

[brunoxy1]

I did that, I found out yesterday:)