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

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

Accurately monitor iron levels with theHanna Instruments HI721 Marine Iron Checker® HC. Also called theHanna 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

• Measuresiron 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 theHanna HI721 Marine Iron Checker® HC—a trusted digital tool for precise trace iron testing. 🧪🪸

More Information

Item	Hanna Instruments Marine Iron Checker HI721
Model Number	HI721
Measurement Range	0.00 to 5.00 ppm (Iron)
Resolution	0.01 ppm
Accuracy	±0.04 ppm ±2% of reading
Testing Method	Colorimetric Method
Battery Type	1.5V AAA
Auto Shut-Off	After 10 minutes of non-use
Application	Marine/Reef Aquariums Only
Reagent Required	HI721-25 (25 Tests per Pack)
Features	Digital Display, Reef-Safe, Portable
Availability	In Stock/Restockable

Need more tests? Get the HI721-25 reagent refill pack or explore the full Hanna Instruments collection atSqueaky’s Aquatics!