API Master Test Kit: https://www.amzn.com/B000255NCI
Test Tube Holder: https://www.amzn.com/B082ZNQM87
API Test Tubes: https://www.amzn.com/B07G4NGMM8
GH / KH Test Kit: https://www.amzn.com/B003SNCHMA

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Testing your Aquarium's water parameters is one of the most important things we need to be doing as responsible fish keepers next to routine maintenance and feeding.

This test kit is essential to your long-term success in the hobby as well as the overall well being of your finned friends! The additional test tubes and holder are not completely necessary but are certainly a welcomed addition to the base test kit since the glass tubes will inevitably break from time to time. (Unless your extra careful!)

I've found that the test tube holder eliminates the chance of knocking over your test tubes and makes things much more streamlined.

BONUS TIP** It's easy to break test tubes when removing the caps after testing, so 1 more hint would be to run a little water over the test tube and cap before removing it. This helps it to slide off much easier, minimizing the chance of breakage.

The GH and KH test kit from API is VERY beneficial if you desire to keep snails, shrimp, or other invertebrates as they require very specific water parameters to thrive and live happily.