NTlabs Calcium Test Kit

The NT Labs Calcium Test Kit lets you measure the calcium concentration in your saltwater, reef, or brackish aquarium — a vital parameter for healthy corals, clams, and other calcium-dependent organisms. Because calcium is a building block for skeletons and shells, maintaining levels around 380–450 mg/L (natural sea-water ~420 mg/L) is important for steady coral growth and balanced water chemistry.

This kit uses a titration method for greater accuracy: you add your sample, reagents, then slowly titrate until the colour change indicates the calcium concentration. It includes all required reagents, a pipette, a test vial, and clear instructions — enough for approximately 35 tests. 

Regular testing with this kit helps you avoid problems caused by calcium depletion or imbalance (which can also affect carbonate hardness / KH), ensuring stable conditions for coral growth and overall aquarium health.