Fast, Accurate Digital Marine Ammonia Testing

Take the guesswork out of monitoring ammonia with the Hanna HI784 Marine Ammonia Checker HC. Designed specifically for saltwater aquariums, this handheld digital colorimeter delivers precise ammonia measurements in just a few simple steps, eliminating the uncertainty of matching colors found in traditional liquid test kits.

Ammonia is one of the most toxic compounds in any marine aquarium, making accurate testing essential for protecting fish, corals, and invertebrates. Whether you're cycling a new aquarium, monitoring a quarantine system, or maintaining an established reef, the HI784 provides reliable digital results you can trust.

Using Hanna's compact Checker HC design, simply prepare your water sample, add the included reagents, and let the digital colorimeter provide an easy-to-read measurement. The HI784 is designed to measure marine ammonia (NH₃-N)with excellent accuracy and repeatability, helping you quickly identify potential problems before they become serious.

Compact enough to fit in your hand yet powerful enough for routine reef maintenance, the HI784 is an excellent addition to any saltwater aquarist's testing arsenal.

Key Features

• Designed specifically for saltwater aquariums
• Digital colorimeter eliminates subjective color matching
• Fast, accurate marine ammonia measurements
• Compact handheld design
• Simple one-button operation
• Large, easy-to-read LCD display
• High accuracy and repeatability
• Auto shut-off to conserve battery life
• Ideal for reef aquariums, fish-only systems, quarantine tanks, and new aquarium cycling

Perfect For

• Reef Aquariums
• Fish-Only Saltwater Aquariums
• Quarantine Systems
• Hospital Tanks
• New Aquarium Cycling
• Professional Aquarium Maintenance

Specifications

• Model: HI784 Marine Ammonia Checker HC
• Parameter: Marine Ammonia (NH₃-N)
• Testing Range: 0.00 to 2.50 ppm
• Resolution: 0.01 ppm
• Accuracy: ±0.05 ppm ±5% of reading @ 25°C (77°F)
• Light Source: LED
• Light Detector: Silicon Photocell
• Auto Shut-Off: Yes
• Power Supply: 1 AAA Battery
• Method: Adaptation of the ASTM Manual of Water and Environmental Technology, D1426 Nessler Method

What's Included

• Hanna HI784 Marine Ammonia Checker HC
• Marine Ammonia Starter Reagents (10 Tests)
• Sample Cuvettes with Caps (2)
• 1 AAA Battery
• Instruction Manual
• Quick Start Guide

Additional replacement reagents (HI784-25) sold separately.

Why You'll Love It

Unlike traditional test kits that rely on interpreting subtle color changes, the Hanna HI784 delivers precise digital readings, helping eliminate user error and improve confidence in your water testing. It's especially valuable when monitoring new aquarium cycles, quarantine systems, or diagnosing water quality issues where accurate ammonia readings are critical.

Compact, easy to use, and highly accurate, the HI784 is trusted by reef hobbyists and aquarium professionals alike.

Why Buy from Infinity and Beyond Aquatics?

At Infinity and Beyond Aquatics, we carefully select equipment trusted by serious hobbyists and professionals. The Hanna HI784 Marine Ammonia Checker provides dependable digital testing, helping you maintain stable water quality and protect your aquarium's livestock with confidence.

Shipping Information

Shipping Available Nationwide

This item ships within 1–3 business days, and tracking information will be emailed as soon as your order ships.

• FREE Standard Shipping on qualifying orders over $100 (U.S. only)
• Orders below the free shipping threshold are calculated at checkout based on your selected shipping method.
• This item is carefully packaged to help ensure it arrives in excellent condition.