API Calcium Test Kit

My reef tank has been struggling with low calcium for weeks, and this liquid test kit finally gave me a clear reading instead of guessing. The color change is easy to see, and I’ve been dosing more confidently since I got it.

My reef tank's corals were looking pale and I couldn't figure out why until I tested calcium with this kit—the color change is super obvious and easy to read. The instructions are clear enough that even a beginner like me got a reliable reading in about five minutes. It's honestly a relief to finall

The dropper bottle makes counting out the exact number of drops for my test pretty straightforward, even when my hands are wet from tank maintenance. It does take a few minutes to get the color match right under my LED lights, but the readings have been consistent with what my LFS gets.