• 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

    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.

    Order 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.


    SKU 334
    Barcode # 4A114840
    Shipping Weight 0.5000kg
    Shipping Width 0.130m
    Shipping Height 0.080m
    Shipping Length 0.200m

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