JBL ProAquaTest GH & Refill

Finally, a test kit with refills that actually last through multiple water changes. The color chart is easy to read even in low light, making it simple to track my hardness levels every week.

The long-lasting refill bottles are such a smart design—makes testing the GH levels every week feel effortless. Even compared to other kits I've used, the color change on the test strips is super clear and easy to read.

Finally, a test kit that comes with refills so I don’t have to buy a whole new set every time. The titration method is straightforward and the color change on the GH test is easy to read.