Hanna Instruments Checker Iron Colorimeter

Item #: 0763


The HANNA HI721 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 HI721 Checker HC is accurate and affordable with immediate results.

The new HI721 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.

  • Ideal for Aquaculture and Aquarium testing!
  • Easier to use and more accurate than chemical test kits!
  • Large, easy to read digits.
  • Auto shut off.
  • Operated by a single AAA battery
  • Use for quick and accurate on the spot analysis.
  • Single button operation: zero and measure.


Range   0.00 to 5.00 ppm (mg/L)
Resolution 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
Method adaptation of the EPA Phenanthroline method 315 B, for natural and treated waters
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 two minutes after reading
Dimensions   81.5mm x 61mm x 37.5mm (3.2″ x 2.4″ x 1.5”)
Weight   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.
Warranty 1 year limited warranty
SKU: 0763 Category:

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