NTlabs Magnesium Test Kit

Maintain stable water chemistry in your reef or marine aquarium with this magnesium-specific test kit from NT Labs. The test measures magnesium concentration — a critical element that helps marine invertebrates, corals, and other reef life properly absorb calcium and build skeletons.

The kit uses a titration method for accuracy: you add the provided reagents to a water sample, then slowly titrate until the colour shifts, giving you a precise reading in mg/L (ppm). It includes everything you need — test vial, reagents, and clear instructions — and covers about 35 tests total.

Regular use of this test helps ensure your magnesium stays around the natural seawater level (about 1300–1400 mg/L), which prevents calcium and carbonate from precipitating and helps maintain stable pH and bioavailability of essential minerals.

Whether used as part of a full testing regime or on its own, the NT Labs Magnesium Test Kit is a simple and reliable tool for ongoing reef-aquarium maintenance.