he Hanna Marine Magnesium Checker HC (HI783) takes the guesswork out of testing magnesium levels in your marine aquarium. Designed specifically for saltwater aquariums and reef tanks, this digital handheld colorimeter delivers easy-to-read magnesium measurements without the hassle of interpreting colour changes in traditional test kits.
Magnesium is essential for maintaining a healthy reef aquarium, helping stabilise calcium and alkalinity levels while supporting coral growth and skeletal development. The Hanna HI783 makes it easy to monitor magnesium levels, giving you greater confidence when managing your reef tank's water chemistry.
Key Features
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Digital Magnesium Testing – Clear LCD display provides results directly in ppm, eliminating colour-matching guesswork.
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Designed for Marine Aquariums – Ideal for reef tanks, coral aquariums and fish-only saltwater systems.
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Accurate Measurements – Measures magnesium between 1000 and 1800 ppm with 5 ppm resolution.
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Simple One-Button Operation – Easy to use for both beginner and experienced reef keepers.
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Compact & Portable – Lightweight handheld design makes regular aquarium testing convenient.
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25 Tests Included – Comes with magnesium reagents for 25 tests, so you're ready to start testing.
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Replaceable Reagents – Compatible with Hanna HI783-25 Marine Magnesium Reagents.
Technical Specifications
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Model: HI783
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Testing Parameter: Magnesium (Mg)
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Measurement Range: 1000–1800 ppm
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Resolution: 5 ppm
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Accuracy: ±5% of reading at 25°C
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Testing Method: Colorimetric EDTA method
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Light Source: LED at 610 nm
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Battery: 1 × AAA (included)
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Automatic Shut-Off: After 10 minutes of inactivity
What's Included?
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Hanna HI783 Marine Magnesium Checker HC
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Magnesium reagents for 25 tests
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2 glass cuvettes with caps
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2 colour-coded 5 mL syringes with tips
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1 AAA battery
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Instruction manual and quick-reference guide
Why Choose Hanna?
If you're serious about maintaining stable water parameters in your reef aquarium, the Hanna Checker range is an excellent investment. With straightforward digital measurements and convenient testing, monitoring your magnesium levels becomes a much simpler part of your regular aquarium maintenance routine.
