• HI721 Iron Checker HC
  • HI721 Iron Checker HC
Hanna Instruments

HI721 Iron Checker HC

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Bring more precise technology to your testing with the Hanna iron colorimeter. You won’t have to struggle to determine colors visually anymore as our handheld colorimeter eliminates the hassle of matching to a color chart by providing a direct digital iron result.

  • Our handheld colorimeter is portable and easily carried in your pocket 
  • One-button operation makes getting your iron results simple 
  • Trust your results are consistent with the built-in timer 


The HI721 Checker® HC (Handheld Colorimeter) provides a simple, accurate and cost-effective way to measure iron. Naturally present in water in low concentrations, iron may affect the taste of water, as well as stain both laundry and household appliances. Also an indicator of corrosion, iron is monitored in industrial plants and water cooling and heating systems. Designed as a more accurate alternative to chemical test kits, the HI721 provides quick, accurate results in a few easy steps.

Features at-a-glance:

  • Easier to use and more accurate than chemical test kits
  • Dedicated to a single parameter
  • Small size, big convenience
  • Ideal for: Water Quality, Education, Industrial, Municipal Water, Aquarium

Extra reagent can be found here



0.00 to 5.00 ppm (mg/L)


0.01 ppm (mg/L)

Accuracy @ 25°C/77°F

±0.04 ppm ±2% of reading

Light Source

LED @ 525 nm

Light Detector

silicon photocell


adaptation of the EPA Phenanthroline method 315 B, for natural and treated waters


0 to 50°C (32 to 122°F); RH max 95% non-condensing

Battery Type

(1) 1.5V AAA


after three minutes of non-use and two minutes after reading


81.5mm x 61mm x 37.5mm (3.2" x 2.4" x 1.5”)


64 g (2.25 oz.)

Ordering Information

HI721 Checker® is supplied with (2) sample cuvettes with caps, iron reagent starter kit for 6 tests (6 powder reagent packets), battery, instructions and quick start guide.


1 year limited warranty