JBL ProAquaTest O2 Oxygen & Refill

I've been struggling with low oxygen in my planted tank, and this test kit finally gave me clear, numerical readings. The color change was easy to read against the included chart, and the refill pack means I won't run out quickly.

Set the test up in about two minutes and the color chart makes the reading totally obvious, even for a beginner like me. It's reassuring to finally know for sure that my tank has enough oxygen without having to guess.

I was worried about low oxygen in my tank after adding new fish, and this test gave me clear readings in just a few minutes. The color chart is easy to match, which helped me decide to add an airstone.