Hanna HI783 Marine Magnesium Checker
The Hanna HI783 Marine Magnesium Checker is a high-precision colorimeter designed for marine aquarists who require accurate and consistent magnesium measurements in saltwater aquariums. Magnesium plays a critical role in reef environments—supporting coral growth, buffering alkalinity, and stabilizing calcium levels—making its monitoring vital for a healthy marine ecosystem.
Designed to replace visually subjective test kits, the HI783 delivers digital, laboratory-quality accuracy in a handheld, user-friendly format, enabling aquarists to maintain ideal conditions for corals and other marine life.
Key Features
High-Range Magnesium Testing: Specifically engineered for marine systems, it measures magnesium levels from 1000 to 1800 ppm.
Reliable EDTA Method: Uses a colorimetric EDTA-based method with a calmagite indicator, producing a blue-to-violet color change in the presence of magnesium.
Compact & Portable: Ergonomic design with a large LCD display and one-button operation simplifies testing and reduces human error.
Temperature Considerations: Ensures best results with prepared samples within 18–28 °C (64–82 °F), highlighting its scientific accuracy.
Auto Shut-Off: Preserves battery life by turning off automatically after 10 minutes of inactivity.
Applications
Saltwater and reef aquariums
Coral frag systems
Marine research laboratories
Aquaculture facilities
Technical Specifications
| Parameter | Specification |
|---|---|
| Measurement Range | 1000 to 1800 ppm Magnesium |
| Resolution | 5 ppm |
| Accuracy (@25 °C) | ±5% of reading |
| Measurement Method | Colorimetric EDTA method using calmagite indicator |
| Color Reaction | Blue to violet tint in sample |
| Light Source | LED @ 610 nm |
| Light Detector | Silicon photocell |
| Environment | 0 to 50 °C (32 to 122 °F); RH max 95% non-condensing |
| Sample Temp Range | 18 to 28 °C (64 to 82 °F) |
| Battery Type | 1 x 1.5V AAA (alkaline) |
| Auto Shut-Off | After 10 minutes of non-use |
| Dimensions | 86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”) |
| Weight | 64 g (2.3 oz) |
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