[Konvas] how to know the pitch of a gera wheel ???

[olivier auverlau]

HI i have somes gears all same pitch with severalls diference of number of 
theets, but all are same pitch
is is smallest than pitch 32 (regular follow focus) ...
i think it is bigger than pitch 50 ...
but i have no idea how to be sure ....

( i need find other similars on ebay so i need pitch size ... )

thanks for any info ???
or maybe i post a scaled scan of one of the gears ????

Olivier .