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Dupla CO2 indicator vs. CO2 test kits

Could someone please explain the difference between the Dupla CO2 
indicator (I think Eheim also has a similar device) and a CO2 test kit? 
 Does the Dupla indicator actually measure CO2 directly?  When it 
indicates sufficient CO2, how much CO2 is in the water?

It seems convenient to have a constant indicator like the Dupla, but not 
if it doesn't do a good job.  I (unfortunately?) purchased the Dupla 
indicator before realizing that it might be insufficient.

Also, does anyone know what the color-changing chemical is that you put 
into the indicator?

Wade Shimoda
wshimoda at hei_com