> the detection limit is about 20 ppb of fluorescein dye ( not very high
for
> this dye, as a commercial fluorometer is well under 1 ppb and often
0,02
> ppb). However it is relatively simple, even if the "Hardware" part
seems a
> bit rough..

The LDRs are probably the limiting factor here. 
With sharp filters, I would think that photodiodes, or even solar cells
would serve nicely.




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