Precision Phosphate Testing for Reef Aquariums

The Hanna Instruments HI774 Marine Phosphate Ultra Low Range Checker HC makes monitoring low phosphate levels in saltwater aquariums simple, precise, and easy to read.

Designed specifically for marine systems and reef tanks, the HI774 provides a digital phosphate reading without relying on traditional color charts. With an ultra-low measurement range designed for reef aquarium conditions, it's an excellent tool for keeping nutrient levels under control while avoiding the problems associated with driving phosphate too low.

Digital Phosphate Results

Traditional phosphate tests can become difficult to interpret at the low concentrations commonly maintained in reef aquariums.

The HI774 uses a handheld colorimeter to analyze the sample and displays phosphate concentration directly on its LCD screen, removing the guesswork of visually comparing subtle color differences.

Ultra Low Range for Reef Systems

The HI774 measures phosphate from 0.00 to 0.90 ppm with a resolution of 0.01 ppm.

This makes it particularly useful for reef aquariums where small changes in phosphate can matter for nutrient management, coral health, algae control, and overall system stability.

Why Monitor Phosphate?

Phosphate is an important nutrient in a reef aquarium, but maintaining an appropriate level is key.

Elevated phosphate can contribute to nuisance algae and interfere with coral calcification, while excessively low nutrient levels may also create challenges in reef systems.

Regular testing helps you understand nutrient trends and make informed decisions about feeding, filtration, water changes, phosphate-removal media, and other nutrient-management methods.

Key Features

• Digital phosphate measurement
• Designed for marine and reef aquariums
• Ultra-low 0.00 to 0.90 ppm measurement range
• 0.01 ppm resolution
• Accuracy of ±0.02 ppm ±5% of reading at 77°F
• Easy one-button operation
• Large digital display
• Compact handheld design
• Automatic shutoff
• Replaceable AAA battery
• HI774-25 replacement reagents available separately
• HI774-11 calibration check set available separately

Specifications

Model: HI774
Parameter: Phosphate
Range: 0.00 to 0.90 ppm
Resolution: 0.01 ppm
Accuracy: ±0.02 ppm ±5% of reading at 77°F / 25°C
Method: Ascorbic Acid Method
Light Source: LED at 525 nm
Light Detector: Silicon Photocell
Battery: 1 × 1.5V AAA
Dimensions: 3.4" × 2.4" × 1.5"
Weight: 2.3 oz

What's Included

• Hanna Instruments HI774 Marine Phosphate Ultra Low Range Checker HC
• 2 sample cuvettes with caps
• Starter reagent kit for 10 tests
• AAA battery
• Instructions
• Quick Start Guide

Why Buy From Infinity and Beyond Aquatics?

Accurate nutrient testing makes it easier to understand what's happening inside your reef aquarium. Infinity and Beyond Aquatics carries trusted testing equipment for aquarists who want consistent, easy-to-read results without the guesswork of traditional color charts.

The Hanna HI774 is an excellent choice for reef keepers who want precise phosphate monitoring as part of their regular aquarium maintenance routine.

Shipping

This product qualifies toward FREE Standard Shipping on orders over $100 within the contiguous United States.

Orders may ship separately from other products depending on inventory location and availability.

Manufacturer: Hanna Instruments
Model: HI774
For Use With: Saltwater and marine aquariums