Hanna HI755 Marine Alkalinity
The Hanna HI755 Marine Alkalinity Checker is a simple, fast, and highly accurate handheld colorimeter designed specifically for measuring alkalinity in marine water as calcium carbonate (CaCO₃). Developed for reef aquarium hobbyists and marine researchers, this checker provides more reliable and consistent results than traditional chemical test kits, while remaining user-friendly and affordable.
This device uses a colorimetric method based on the reaction of the sample with specific reagents, producing a visible color change that is then measured digitally. It’s especially helpful for maintaining the right alkalinity levels essential for coral health and marine ecosystem stability.
Key Features
Ideal for Reef Aquariums: Helps monitor alkalinity to support healthy coral growth and marine life.
Simple One-Button Operation: Easy-to-use design allows for quick measurements with minimal user training.
High Accuracy and Resolution: Measures alkalinity from 0 to 300 ppm with 1 ppm resolution and ±5 ppm ±5% of reading accuracy.
Compact and Portable: Small enough to fit in your hand or pocket; perfect for on-site aquarium maintenance.
Digital Display: Provides a clear, direct reading — no more subjective color chart interpretation.
Technical Specifications
| Parameter | Details |
|---|---|
| Measurement Range | 0 to 300 ppm CaCO₃ |
| Resolution | 1 ppm |
| Accuracy @ 25°C | ±5 ppm ±5% of reading |
| Method | Colorimetric |
| Light Source | LED (wavelength not specified) |
| Light Detector | Silicon photocell |
| Battery Type | (1) 1.5V AAA |
| Auto Shut-Off | Typically after 10 minutes (est.) |
| Environment | 0 to 50°C; RH max 95% non-condensing |
| Dimensions | 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”) |
| Weight | 64 g (2.25 oz.) |
Applications
Saltwater Aquariums
Reef Tank Maintenance
Marine Biology Research
Aquaculture Water Testing
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