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Hanna HI721 Iron Checker

Product code: 2497

Availability: In stock

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Hanna Iron Checker HI721

The new HI 721 Checker HC portable handheld colorimeter features a resolution of 0.01 ppm (500 points) and 0.04 ppm 2% of reading accuracy. The HI 721 CheckerHC uses an adaptation of Standard Method 315 B.

Hanna Iron Checker HI721.

  • Easier to use and more accurate than chemical test kits

    Phenanthroline method   
    ±0.04 ppm ±2% of reading accuracy
    0.01 ppm (mg/L) resolution (500 points)
    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 64 g (2.25 oz.), the Checker®HC easily
    fits into the palm of your hand or pocket
    Use for quick and accurate on the spot analysis
    One button operation: zero and measure
    Operated by a single AAA battery

  • Ideal for:

    Industrial, ground and treated waters, mining leachate monitoring and
    agricultural irrigation water

  • For use in fresh and saltwater


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 (500 points) and ±0.04 ppm ±2% of reading accuracy. The HI 721 Checker®HC uses an adaptation of Standard Method 315 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. It’s that easy.

Product Information:
HI 721 Checker®HC is supplied with sample cuvettes with caps (2), powder reagents for iron (6), battery and instructions.

Range   0.00 to 5.00 ppm (mg/L)
Resolution   0.01 ppm (mg/L)
Accuracy @ 25°C   ±0.04 ppm ±2% of reading
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 three minutes of non-use and ten seconds after reading
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 the EPA Phenantroline method 315 B, for natural and treated waters.

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  1. Works well, easy to use - just keep a few things in mind Review by MD
    Product Rating:

    Only one reagent, similar to the PO checker. Works fine, I tested it by adding Red Sea iron to an empty 10g tank, the test came exactly at what RS claims the concentration should be. I will be using it for my algae growing tank where I want to keep iron higher. Keep in mind that it will likely read 0 in most reef tanks as the concentration of iron in SW is way below checker's capabilities. If you are however following the RS program they recommend keeping iron at 0.15ppm which I guess could be tested with this. (Posted on 11/9/2017)

  2. Handy Little Kit Review by Ithacajosh
    Product Rating:

    What a great kit! I test water daily, and I've used several iron test kits. Each one had a flaw, for one reason or another. Not this one. It's self-contained, easy to use, and accurate. If you follow the directions you cannot screw it up! (Posted on 1/22/2015)

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