
API Master Test Plus GH & KH
thingiverse
I really like the design by lanepulcini, and have used their design for quite some time. I recently have started testing GH (General Hardness) and KH (Carbonate Hardness) in my Shrimp Tank and I needed a bigger test tube holder. So building upon the original design, I incorperated extra tube holders to test everything together. Will post pictures once printed.
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