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Hanna HI 721 Checker HC Iron Photometer HI721 - (50) HI721-25 Reagents


  • $ 6099

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Item Description: Brand New Hanna Instruments HI 721 Checker®HC Iron Photometer 0.00-5.00 ppm(mg/l) - WITH (50) EXTRA HI721-25 Iron Reagents



Hanna HI 721 Checker Colorimeter SPECS:

  • Range 0.00 to 5.00 ppm (mg/L)
  • Resolution 0.01 ppm (mg/L)
  • Precision ±0.04 ppm (mg/L) ±2% of reading @ 25°C
  • Light Source LED @ 525 nm
  • Light Detector Silicon photocell
  • Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
  • Battery Type (1) 1.5V AAA
  • Auto-off After 2 minutes of non-use and after read
  • Dimensions 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)
  • Weight 64 g (2.25 oz.)
  • Method Adaptation of Standard Method 3500-Fe B.

Hanna HI 721 Checker Colormeter is supplied with:

  • (2) sample cuvettes with caps
  • (6) powder reagents for Iron (Buy at least 25 extra pouches and save on S&H!)
  • (1) 1.5V AAA
  • battery and instructions.

Hanna HI 721 Checker Colorimeter FEATURES:

  • Works in Salt Water!
  • Easier to use and more accurate than chemical test kits
  • Adaptation of Standard Method 3500-Fe B. 
  • Accuracy 2% ±0.04 ppm (mg/L) of reading
  • 0.01 ppm (mg/L) resolution
  • Large, easy to read digits
  • Auto shut-off
  • Dedicated to a single parameter
  • Designed to work with HANNA’s powder reagents
  • Uses 10 mL glass cuvettes
  • Small Size, Big Convenience
  • Weighing a mere 65 g (2.3 oz.), the Checker®HC easily fits into the palm of your hand or pocket.
  • Use for quick and accurate on the spot analysis.
  • Single button operation: Zero and Measure
  • Operated by a single AAA battery
  • Did we mention that its Salt Water Compatible?


About 6.3% of the earths crust is made of iron, of which 43% is in soils. The analysis of iron is often performed to monitor ground water and irrigation waters as a gauge of corrosion from industrial settling, and as an indication of the effectiveness of treatment from mining leachate.  The HANNA HI 721 Checker®HC bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate and only give 5 to 10 points resolution while professional instrumentation can cost hundreds of dollars and can be time consuming to calibrate and maintain. The HANNA HI 721 Checker®HC is accurate and affordable with immediate results.  The new HI 721 Checker®HC portable handheld colorimeter features a resolution of 0.01 ppm (5000 points) and ±2% of reading ±0.04 ppm accuracy. The HI 721 Checker®HC uses an adaptation of Standard Method 3500-Fe B.

The contoured style of this Checker®HC fits in your palm and pocket perfectly and the large LCD is easy to read. The auto shut-off feature assures the battery life will not be drained if you forget to turn it off.  The HI 721 Checker®HC is extremely simple to use.  First, zero the instrument with your water sample.  Next, add the reagent. Last, Place the vial into the HI 721 Checker®HC, press the button and read the results. Yeah, it’s that easy!


  • Industrial, Ground and Treated Waters
  • Mining Leachate Monitoring
  • Agricultural Irrigation Water

HI 731318 Tissue for Wiping Cuvets
HI 731331 Glass Cuvet for HI 957xx Series Meters
HI 731353 Caps for cuveettes
HI 93703-50 Solution for Cleaning Cuvets
Reagents & Standards
HI 721-25 Reagents for 25 test (Iron)

Here's some of the Hanna Literature:


S&H within the USA (and it's territories) is a flat rate of FREE via USPS. 

International S&H is $12.00 to Canada and $15.00 to the rest of the world!


National Industrial Supply
30777 Rancho California #891420
Temecula, CA 92589, USA
Sales: 951.308.9269
Fax: 310.833.7306 

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