[Cell-biology] old centrifuge without a speed indicator

[Porpyrin]

Hi ALL,

Recently, I got an old centrifuge for my tissue culture. A problem is
there is no clear indicator for a speed. There is just numbers from 1
to 7.

The model is:
    DAMON IEC DIV ~ CLINICAL CENTRIFUGE

    http://cgi.ebay.com/DAMON-IEC-DIV-CLINICAL-CENTRIFUGE-UNIV-SURPLUS_W0QQitemZ130101083688QQihZ003QQcategoryZ26232QQcmdZViewItem

    http://imagehost.vendio.com/bin/imageserver.x/00000000/indywhorah/Centrifuge4.jpg


Does any body know how can I know the speed from the numbers? I need
to set the speed at 1000-2000 rpm.

Thanks,

Young