Salifert Calcium Test Kit

Salifert has been my personally preferred brand of test kit for the past 22+ years.

Manufacturer's description:

With the Salifert Calcium Aquarium Test Kit, you can easily test the calcium level in your tank. A favorite of discerning reefers for years, Salifert Aquarium Test Kits feature easy to read results.

• Measures in steps of 5 mg/L and has an accuracy of 10 mg/L
• Precise color change, detecting small but significant fluctuations in the concentration of calcium
• Test not affected by magnesium
• Sufficient for 50-100 tests (closer to 50)