Hanna Marine Magnesium Checker HI783

The HI783 Marine Magnesium Checker HC is a handheld colorimeter designed to measure magnesium levels in saltwater aquariums and marine biology applications. Using the Beer-Lambert principle, the HI783 determines magnesium concentration colorimetrically, offering greater accuracy than traditional chemical test kits.

Ideal for Aquariums and Marine Biology

The HI783 is perfect for:

• Marine and saltwater aquariums

• Aquaculture and marine biology research

Its measurement range of 1000–1800 ppm is ideal for coral/fish and fish-only aquariums, ensuring proper magnesium levels for healthy aquatic life.

Compact, Accurate, and Convenient

• Easier to use and more accurate than chemical test kits

• Small size, big convenience – portable for home or field use

• Resolution: 5 ppm

• Accuracy: ±5% of reading @ 25 °C

• Light Source: LED @ 610 nm

• Light Detector: Silicon photocell

• Method: Adaptation of the colorimetric EDTA method using calmagite indicator

Why Magnesium Matters

Magnesium is the third most abundant ion in seawater, after sodium and chloride. It forms weak ion pairs with carbonate ions, making calcium and carbonate available for uptake by corals and invertebrates. Low magnesium levels can lead to:

• Precipitation of calcium as insoluble calcium carbonate

• Impaired growth and health of aquatic inhabitants

• Low or unstable calcium and alkalinity levels

Technical Features

• Operating Environment: 0 to 50 °C; max. 95% RH non-condensing

• Prepared sample cuvette temperature: 18–28 °C

• Battery Type: 1.5V AAA Alkaline

• Auto Shut-Off: After 10 minutes of non-use

• Weight: 64 g