HI721 Iron Checker® HC Colorimeter – Professional Iron Testing Made Simple
Achieve lab-quality iron measurements anywhere with the HI721 Checker® HC handheld colorimeter. This pocket-sized professional instrument delivers precise iron (Fe) analysis from 0.00 to 5.00 mg/L, making it essential for aquarium water quality, swimming pool maintenance, drinking water testing, and environmental monitoring applications.
Why Choose HI721 Iron Checker HC?
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Lab-quality accuracy – ±0.04 mg/L precision with 0.01 mg/L resolution delivers professional results comparable to benchtop instruments
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EPA-adapted method – Uses proven Phenanthroline colorimetric method for reliable, industry-standard iron measurements
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Low-range optimization – 0-5 mg/L range perfectly suited for aquariums, pools, and drinking water where iron should be minimal
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Ultra-portable design – Compact Checker HC (3.2" x 2.4" x 1.5") fits in your pocket for on-site testing anywhere
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Simple three-step operation – Fill cuvette, add reagent, read result—no complex procedures required
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CAL Check validation – Built-in feature verifies meter performance for quality assurance and compliance
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Large LCD display – Easy-to-read screen shows iron concentration in mg/L (ppm) at a glance
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Auto shut-off – Conserves battery with automatic 10-minute power-down
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Complete starter kit – Includes cuvettes, reagents, battery, and protective carrying case
Why Iron Testing Matters
Aquariums: Excess iron promotes nuisance algae growth and can harm sensitive fish species. Monitoring iron helps maintain optimal water quality.
Swimming Pools: Iron causes brown staining of pool surfaces, water discoloration, and unsightly rust marks. Testing prevents costly damage.
Drinking Water: Iron creates metallic taste, stains fixtures and laundry, and can indicate pipe corrosion. The EPA secondary standard is 0.3 mg/L—the HI721's low range is ideal for compliance monitoring.
Hydroponics: Iron is an essential micronutrient, but excess levels can cause toxicity. Precise monitoring ensures optimal plant nutrition.
How It Works
The HI721 uses an EPA-adapted Phenanthroline colorimetric method. Iron reacts with the reagent to produce an orange-red color proportional to iron concentration. The built-in LED light source (525 nm) and silicon photocell detector measure the color intensity and display the precise iron concentration digitally.
Simple testing procedure:
- Fill cuvette with 10 mL water sample to line
- Add HI721 reagent packet and mix thoroughly
- Wait 3 minutes for color development
- Insert cuvette into HI721 Checker HC
- Press button to read iron concentration in mg/L
Technical Specifications
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Model: HI721
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Parameter: Iron (Fe)
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Range: 0.00 to 5.00 mg/L (ppm)
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Resolution: 0.01 mg/L
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Accuracy @ 25°C: ±0.04 mg/L ±3% of reading
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Testing method: EPA Phenanthroline colorimetric method
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Light source: LED @ 525 nm
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Light detector: Silicon photocell
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Battery: 1 x 1.5V AAA (included)
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Auto shut-off: After 10 minutes of non-use
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CAL Check: Built-in validation feature
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Dimensions: 81.5 x 61 x 37.5 mm (3.2" x 2.4" x 1.5")
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Weight: 1 lb
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Origin: Manufactured in Romania by Hanna Instruments
Applications
Essential for aquarium water quality management, swimming pool and spa chemistry monitoring, drinking water quality testing (EPA compliance, well water analysis), hydroponics nutrient solution monitoring, environmental water testing, laboratory iron analysis, and any application requiring accurate low-range iron measurement. Perfect for aquarium hobbyists, pool service professionals, water treatment operators, environmental consultants, and hydroponics growers.
Why Choose a Checker HC Over Test Kits?
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Eliminates subjectivity – No more squinting at color charts or debating between shades
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Better accuracy – Digital precision vs. visual estimation
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Faster results – Direct digital readout saves time
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Consistent performance – LED light source ensures repeatable measurements regardless of ambient lighting
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Professional credibility – Lab-quality results for compliance and documentation
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CAL Check validation – Verify meter performance for quality assurance
What's Included
HI721 Iron Checker® HC colorimeter, 2 sample cuvettes with caps, iron reagents for initial testing, 1.5V AAA battery, instruction manual, instrument quality certificate, and rigid protective carrying case.
Reagent Availability
Replacement reagents available separately as HI721-25 (25 tests) and HI721-100 (100 tests). Each reagent packet is pre-measured for consistent, accurate results.
Maintenance & Care
Clean cuvettes with distilled water after each use. Store in protective case when not in use. Replace battery when low battery indicator appears. Use CAL Check feature periodically to verify meter performance. Keep reagents stored in a cool, dry place.
