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HI-701 Free Chlorine Handheld Colorimeter - Checker®HC

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Ideal for swimming pools, spas and aquariums.

Chlorine is the most commonly used water disinfectant and by monitoring chlorine regularly and accurately, serious health and safety risks can be avoided.

Can also be used to determine chlorine levels in fish tanks for optimum fish and plant health. Use alongside recommended dechlorinators.

Checker®HC is supplied with reagents for 6 tests. Use code HI-701-25 (25 tests) for future purchases.

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Ideal for swimming pools, thermal baths, water filters and aquariums!

Chlorine is the most common water disinfectant and by monitoring chlorine regularly and accurately, serious health and safety hazards can be avoided.

The HANNA HI-701 is designed to fit in the palm of your hand. The large LCD screen is easy to read and the auto power off feature ensures that the battery life will not run out if you forget to turn it off.

It can also be used to determine chlorine levels in aquariums for optimal fish and plant health.

Ideal for:

chlorine tester

Swimming pools and thermal baths

Check water and aquarium filters

Disinfection applications



chlorine tester

The test is quick and easy

High-precision results - more accurate than chemical test kits

The auto-off feature means it automatically shuts off automatically

Fully portable, fits easily in palm and pocket

It comes with


2 vials

6 reagents. You can find reagents on our page

1 x 1,5 AAA battery


  • Reset the counter
  • Add the reagent to the vial
  • Insert the vial into the checker
  • Press the button for results


  • Range 0.00 to 2.50 ppm (mg/L)
  • Resolution 0.01 ppm (mg/L)
  • Precision 3% of reading ±0.03 ppm (mg/L) @ 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 EPA approved DPD method Standard Method 4500-Cl G.

Please Note

In some cases, samples may contain other parameters which may interfere with results. Interference may be caused by: Bromine, Iodine, Ozone, Oxidized forms of Chromium and Manganese. In case of water with hardness greater than 500 mg/L CaCO3, shake the sample for approximately 2 minutes after adding the powder reagent.

If the water used for this procedure has an alkalinity value greater than 250 mg/L CaCO3 or acidity value greater than 150 mg/L CaCO3, the colour of the sample may develop only partially, or may rapidly fade. To resolve this, neutralise the sample with diluted HCl or NaOH.

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