Phosphate Checker for Marine Reef Tanks: Portable HI774 Colorimeter for Simple, Accurate Water Testing

Keep a closer eye on phosphate during routine marine and reef tank care using the portable HI774 handheld colorimeter. Its one-button operation provides an approachable way to obtain numerical readings without relying on a standard chemical test kit.

Regular phosphate testing offers useful insight into reef water chemistry. Excessive levels can interfere with coral calcification and growth while encouraging nuisance algae that competes for light, nutrients, and space.

Key Features

• Measures phosphate from 0.00 to 0.90 ppm, giving reef keepers a defined range for regular water checks.
• Provides 0.01 ppm resolution and stated accuracy of ±0.02 ppm ±5% of the reading at 25°C, supporting more precise phosphate monitoring.
• Simple one-button operation keeps recurring aquarium tests easy to manage as part of a consistent care routine.
• The portable handheld format can travel between aquariums, making it convenient for testing multiple marine systems.
• Dedicated single-parameter operation keeps each test focused on phosphate, an important part of understanding reef tank water chemistry.

Specifications

• Brand: Hanna Instruments
• Model: HI774
• Measurement range: 0.00 to 0.90 ppm
• Resolution: 0.01 ppm
• Accuracy at 25°C (77°F): ±0.02 ppm ±5% of reading
• Light source: LED at 525 nm
• Light detector: Silicon photocell
• Method: Adaptation of the Ascorbic-Acid method
• Battery: One 1.5V AAA battery
• Auto shut-off: After 7 minutes of non-use and 2 minutes after reading
• Operating environment: 0 to 50°C (32 to 122°F), maximum 95% RH non-condensing
• Dimensions: 86.0 × 61.0 × 37.5 mm (3.4 × 2.4 × 1.5 in.)
• Weight: 64 g (2.3 oz)
• Included: Two capped sample cuvettes, phosphate ULR reagent starter kit for 10 tests, batteries, instructions, and quick-start guide
• Warranty: 1 year

Make the HI774 part of a steady reef-care routine to track phosphate clearly and respond thoughtfully to changing water conditions that affect coral and aquatic life.