hi, I just got my ph drop checker. to be true, this is not what I thought.
what I have is the glass "checker" (dont know how it's call), a cheap chart that tells me what colour match each ph level and a bottle of co2 test.
they say: add 5 drop of co2 test, add water from the aquarium up to the level (witch level).
I thought we use a know kh solution in these things? also, how mutch water for those 5 drop since there is no "level"?
How will I know what CO2 level there is in my thank with this ph chart? If I would have wanted to know what ph I have, I would have use way beter checker.
also, yes, the colour might change (did not over the last 45min) once Co2 from the tank make the colour change but what does it tells me?

thanks