KH & CO2 Content Test

I have and use the Tetratest kit. It has a test for KH & CO2 and I'm not sure how to read it. When I do the drops of KH test into the 5ml vial of tank h2o, it takes 18 drops to make the color change, however it's only to a greenish-yellow. To get it to turn yellow it takes 20. Then I read the CO2 content sheet and it says for my Ph & KH combined it's 3.0 total CO2. Is this good?? I'm not sure what all this means or what to do to correct or if correction is even needed. Any help would be great, since I never even took chemistry in school.

all my other tests are perfect!

 

This might clarify it for ya. It's a blue box and the name of the company is Laborette. Anybody know?

 

Try their online help system.

What Is TetraCare?

 

Their links don't work for register, "Existing Aquarium". I tried that.

 

I found their phone number. Tetra