Take the guesswork out of reef aquarium water testing with the Hanna Marine Ultra Low Range Phosphate Checker® HC – HI774. Designed specifically for saltwater aquariums, this compact digital phosphate tester delivers accurate, easy-to-read results, making it an essential tool for maintaining a healthy reef tank.
Phosphate plays an important role in marine aquarium health, but maintaining the right balance is critical. Excess phosphate can contribute to nuisance algae growth and inhibit coral skeletal growth, while extremely low phosphate levels can negatively affect coral health. The Hanna HI774 makes monitoring phosphate levels simple, helping you maintain stable water parameters and provide the best possible environment for your corals.
Unlike traditional colour-matching test kits, the Hanna Checker uses a digital colourimeter to measure phosphate concentrations, eliminating the need to interpret subtle colour differences. With an impressive 0.01 ppm resolution, it's particularly useful for reef keepers who need to monitor low phosphate levels accurately.
Key Features
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Ultra Low Range Testing: Measures phosphate concentrations from 0.00 to 0.90 ppm, ideal for marine and reef aquariums.
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Digital Accuracy: Provides clear numerical results without the guesswork of traditional colour charts.
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0.01 ppm Resolution: Perfect for monitoring the low phosphate concentrations commonly maintained in reef aquariums.
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Easy to Use: Simple single-button operation makes phosphate testing straightforward.
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Ideal for Coral Health: Helps reef keepers monitor nutrient levels in SPS, LPS and mixed reef aquariums.
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Compact & Portable: Lightweight handheld design for convenient aquarium maintenance.
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Ready to Use: Includes sample cuvettes, battery and starter reagents for 6 tests.
Hanna HI774 Specifications
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Specification
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Details
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Brand
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Hanna Instruments
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Model
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HI774
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Test Parameter
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Phosphate (PO₄³⁻)
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Testing Range
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0.00–0.90 ppm
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Resolution
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0.01 ppm
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Accuracy
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±0.02 ppm ±5% of reading at 25°C
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Testing Method
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Ascorbic Acid Colorimetric Method
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Light Source
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LED at 525 nm
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Battery
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1 × AAA 1.5V
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Dimensions
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86 × 61 × 37.5 mm
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Weight
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64 g
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Suitable For
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Marine & Reef Aquariums
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Why Test Phosphate in Your Reef Aquarium?
Phosphate is one of the most important nutrients to monitor in a saltwater aquarium. While corals require some phosphate for healthy biological processes, excessive concentrations can encourage nuisance algae growth and interfere with coral calcification.
Regular phosphate testing allows you to monitor changes in your aquarium's nutrient levels and make informed adjustments to feeding, filtration and nutrient export.
The Hanna HI774 is particularly popular among reef keepers maintaining SPS-dominant and mixed reef aquariums, where nutrient stability is essential.
What's Included?
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1 × Hanna HI774 Phosphate Checker® HC
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2 × Sample cuvettes with caps
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Phosphate ULR reagents for 6 tests
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Instruction manual and quick start guide
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Replacement Reagents
The Hanna HI774 uses Hanna HI774-25 Marine Phosphate Ultra Low Range Reagents, available separately in packs of 25 tests.
For continued accuracy, we recommend keeping your glass cuvettes clean and free of fingerprints, scratches and residue before every measurement.
Serious about reef keeping? The Hanna Marine Ultra Low Range Phosphate Checker is one of the most useful investments you can make in your aquarium's water testing equipment. Simple, reliable and accurate, it gives you the confidence to manage phosphate levels and maintain a thriving reef aquarium.
