Red Sea Calcium Pro Test Kit

The Red Sea Calcium Pro Test Kit is a high-accuracy titration test kit for measuring calcium in reef aquariums. Calcium is one of the most important elements for coral skeletal growth, and maintaining stable levels (typically 400–450 ppm) is essential for healthy SPS and LPS corals. This kit delivers professional-grade precision at ±2.5 ppm.

Pairs perfectly with the Reef Foundation Pro Test Kit (Ca/Alk/Mg), the Trace Colors PRO Test Kit, and any Red Sea 4-Part Reef Care Dosing System (Small, Medium, Large).

Looking for more testing gear? Browse our Test Kits & Reagents collection.

• High-accuracy calcium titration test (±2.5 ppm)
• 75 tests per kit
• Professional-grade precision for reef aquarium monitoring
• Affordable reagent refills available
• Part of the complete Red Sea Reef Care Program

What calcium range should I aim for?
Most reef tanks run 400–450 ppm. Stability matters more than hitting an exact number.

How often should I test calcium?
Weekly for most reefs; 2–3 times per week if you're running a heavy SPS load or dosing manually.

Is this a reef/saltwater-only kit?
Yes — calcium testing at this precision is specifically for saltwater reef systems.

Can I get refills?
Yes — Red Sea sells individual reagent refills so you're not buying the full kit every time.