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DIY Dupla CO2 indicator

George wrote:
> The CO2 indicator is showing the pH of the water vapor entering the
> body of the indicator.  The body contains a liquid indicator that
> changes color around pH 7 (bromthymol blue ?)

Hi All,

Apparently the Dupla CO2 indicator is a fairly simple device.  Did somebody
ever try to conctruct a similar device oneself ?

Christian Breckpot