Hardness Test Kit ?

[RIDavid]

I have an API hardness test kit. I'm not really sure how to use it. It says count the drops when it gets a certain shade but does not have a chart to match up like thier other test kits.

 

[KISSfn]

For KH, count the drops needed to turn the water to bright yellow. For GH, drops added to turn water green.

Drops - ppm KH/GH
1 - 17.9
2 - 35.8
3 - 53.7
4 - 71.6
5 - 89.5
6 - 107.4
7 -125.3
8 -143.2
9 -161.1
10 -179
11 -196.9
12 -214.8