Test Kit: Calcium
G2860
The Waterbox Calcium Test Kit delivers quick, reliable testing to measure calcium (Ca) levels in saltwater aquariums. Calcium is essential for coral skeletal growth, invertebrate shell formation, and the development...
Or build it into a bundle — save up to 6% ↓What it is, and who it is for.
The Waterbox Calcium Test Kit delivers quick, reliable testing to measure calcium (Ca) levels in saltwater aquariums. Calcium is essential for coral skeletal growth, invertebrate shell formation, and the development of coralline algae. When levels drop too low, coral growth slows and overall reef stability can be affected.
Maintaining calcium within the recommended 420–460 ppm range supports strong coral structure, vibrant coloration, and a balanced relationship with alkalinity and magnesium. Regular testing alongside alkalinity and magnesium helps maintain a balanced and thriving environment.
Each kit provides enough reagents for roughly 55–65 individual tests.
Build around the Test Kit: Calcium.
It's already in your system below. Add the flow, filtration and dosing around it and the discount starts working — tiers climb as the build grows, and the reef meter fills with it.
Pick the right one, not the biggest one
The honest line-up from test kits. Most buyers reading this page should buy the middle column.
Test Kit: Magnesium
Test Kit: Calcium
JBL ProAquaTest Freshwater Test SetAsked before checkout
The questions our support inbox actually gets.
Does it ship quickly?+
Orders placed before 2 PM ET on a business day leave the same day. Tracking is emailed the moment the label prints.
What if it's the wrong fit for my tank?+
Return it. 30 days, no restocking fee, refund to the original payment method. Better: tell us your tank first and we'll spec the system for free — half of all returns are sizing problems.
Who handles the warranty?+
We do. Everything carries the manufacturer's warranty and we run the claim for you — one email to us instead of a ticket queue.
How does the bundle discount work?+
Add items in the bundle builder: 2+ items saves 5%, 3+ saves 8%, 4+ saves 12%, and 5+ saves 15% off the whole system, applied at checkout.