API test tube holder

thingiverse

I have numerous freshwater tanks filled with fish and shrimp, requiring me to regularly test the water using kits from reputable brands like API. The tubes included in these kits are extremely slender and prone to toppling over easily, prompting me to design a holder that can securely contain a large number of tubes during testing. This simple snap-together device is the result of my efforts, and I hope it proves useful for others who face similar challenges.