Hanna Instruments HI721 / 721 – Marine Iron Colorimeter – Checker® HC

Hanna Instruments HI721 – Marine Iron Colorimeter – Checker® HC 🌊🧲

Accurately monitor iron levels with the Hanna Instruments HI721 Marine Iron Checker® HC. Also called the Hanna 721, this handheld colorimeter provides fast, digital results for reliable monitoring of trace iron in reef aquariums. 🐠🔬

🌿 Why Iron Matters

Iron plays a key role in coral health, macroalgae growth, and overall reef nutrient balance. Excess iron can harm corals, while deficiency may limit essential biological processes. The HI721 makes it simple to track and manage iron levels with precision.

🖐️ Simple, Digital Testing

Forget hard-to-read chemical kits. With the HI721, just add reagent, insert the cuvette, and push a button for a quick and accurate digital readout.

🔗 Pairs with HI721-25 Reagents

Use with HI721-25 reagent refills (sold separately), each providing 25 tests per pack.

🔑 Key Features

• Measures iron in saltwater from 0.00 to 5.00 ppm
• ±0.04 ppm ±2% of reading accuracy
• Resolution: 0.01 ppm
• Digital colorimeter with LCD display
• Compact, portable, reef-safe design
• One-button operation

📦 What’s Included

• HI721 Checker® HC Colorimeter
• Two sample cuvettes with caps
• Starter reagent packets (6 tests – HI721-25)
• 1.5V AAA battery
• Instruction manual

Keep your reef balanced with the Hanna HI721 Marine Iron Checker® HC—a trusted digital tool for precise trace iron testing. 🧪🪸

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