"Emir Khatipov" <khatipovNO at NOuchicago.edu> wrote in message
news:cwub9.42$a5.9974 at news.uchicago.edu...
> However, given the amount of work involved I did not think that would fall
> under "simple way" category requested in the original post :-), but it,
> again, depends what is simpler, to buy a colony counter or a spec., or
> analytical balance with at least 5 digit accuracy.
As far as colony counting is concerned, you can't beat the good old
fashioned felt tip pen and magnifier - especially for school kids!