Product Description
HI721 Iron Checker® HC Colorimeter – Professional Iron Testing Made SimpleAchieve 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?
Lab-quality accuracy – ±0.04 mg/L precision with 0.01 mg/L resolution delivers professional results comparable to benchtop instruments
EPA-adapted method – Uses proven Phenanthroline colorimetric method for reliable, industry-standard iron measurements
Low-range optimization – 0-5 mg/L range perfectly suited for aquariums, pools, and drinking water where iron should be minimal
Ultra-portable design – Compact Checker HC (3.2" x 2.4" x 1.5") fits in your pocket for on-site testing anywhere
Simple three-step operation – Fill cuvette, add reagent, read result—no complex procedures required
CAL Check validation – Built-in feature verifies meter performance for quality assurance and compliance
Large LCD display – Easy-to-read screen shows iron concentration in mg/L (ppm) at a glance
Auto shut-off – Conserves battery with automatic 10-minute power-down
Complete starter kit – Includes cuvettes, reagents, battery, and protective carrying case
Why Iron Testing MattersAquariums: 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 WorksThe 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
Model: HI721
Parameter: Iron (Fe)
Range: 0.00 to 5.00 mg/L (ppm)
Resolution: 0.01 mg/L
Accuracy @ 25°C: ±0.04 mg/L ±3% of reading
Testing method: EPA Phenanthroline colorimetric method
Light source: LED @ 525 nm
Light detector: Silicon photocell
Battery: 1 x 1.5V AAA (included)
Auto shut-off: After 10 minutes of non-use
CAL Check: Built-in validation feature
Dimensions: 81.5 x 61 x 37.5 mm (3.2" x 2.4" x 1.5")
Weight: 1 lb
Origin: Manufactured in Romania by Hanna Instruments
ApplicationsEssential 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?
Eliminates subjectivity – No more squinting at color charts or debating between shades
Better accuracy – Digital precision vs. visual estimation
Faster results – Direct digital readout saves time
Consistent performance – LED light source ensures repeatable measurements regardless of ambient lighting
Professional credibility – Lab-quality results for compliance and documentation
CAL Check validation – Verify meter performance for quality assurance
What's IncludedHI721 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 AvailabilityReplacement reagents available separately as HI721-25 (25 tests) and HI721-100 (100 tests). Each reagent packet is pre-measured for consistent, accurate results.Maintenance & CareClean 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.
