>  You have right. But I feel that Mauricio is far away from 
> the ppm range.
> I'm wrong ?

Yes, by choice. We have 2 different models. One has 3 leds that indicate
low, medium and high concentration, so accuracy is not an issue.
The other model has an LCD and shows the concentration, currently in 50ppm
steps.

I don't really know how are we going to do this at the moment. I have 2 week
to carefouly think about it and decide.

Thanks everyone for your inputs.

Mauricio Jancic

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