+44 (0)1525 850 855
Order before 4pm for same day dispatch Weekdays only
HANNA HI-711 Total Chlorine Pocket Checker
HANNA HI-711 Total Chlorine Pocket Checker

In Stock 5 Items available


The Hanna HI-711 is a real world first - a fully featured photometer at a pocket sized price. With the Hanna Total Chlorine Checker you can check for chlorine at the touch of a button and get instant results.

0.00 to 3.50 ppm
Ideal for swimming pools

£72.00 (exc.VAT)
£86.40 (tax incl.)
Full Description Specification Manuals

Ideal for swimming pools, spas and aquariums

Chlorine is the most common water disinfectant. Once in water, it presents as free chlorine and total chlorine.

Free chlorine is the chlorine that is available in the water to tackle bacteria. As the process of disinfection takes place, the levels of free chlorine will reduce. Total chlorine is the measurement of free and used chlorine in the water.

If the total chlorine is high but the free chlorine is low or non-existent, then there is insufficient chlorine in the water to deal with the levels of contamination.

Free chlorine is the most frequently tested of the two chemicals. By checking for the two as part of a rigorous testing procedure, adjustments in chlorine levels can be made quickly and easily and a high level of disinfection can be easily maintained.

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

Ideal for

  • Swimming pools and spas
  • Water and quality control checks
  • Disinfection
  • Waste water treatment
  • Marine and salt water Aquaculture

Main Benefits

  • Testing is quick and easy
  • High precision results - more accurate than chemical test kits
  • Auto shut-off feature means the Checker cannot be left on by mistake
  • Fully portable, fitting easily into both palm and pocket

Supplied with

  • 2 sample cuvettes
  • Cuvette cap
  • Starter pack of reagents x 6 (re-ordering information: HI-711-25 x 25 tests)
  • 1 x 1.5 AAA battery
  • Instructions

Also available: Calibration set HI-711-11

Four steps. One click. Instant Readout.

Step 1  1. ‘Zero’ the Checker®HC with your vial & water sample inside

Step 2  2. Take the vial out and add your reagent

Step 3  3. Place your vial into your Checker®HC

Step 4  4. Press the button and read the results

Use Calibration Check Set HI-711-11 with the HI-711 Total Chlorine Handheld Colorimeter - Checker®HC.

Use Reagents HI-711-25 with the HI-711 Total Chlorine Handheld Colorimeter - Checker®HC, x 25 tests

Read More

Range0.00 to 3.50 ppm
Resolution0.01 ppm (mg/L)
Precision3% of reading ±0.03 ppm (mg/L) @ 25°C
Light SourceLED @ 525 nm
Light DetectorSilicon photocell
Environment0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type(1) 1.5V AAA
Auto-offAfter 2 minutes of non-use and after reading
Dimensions81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)
Weight64 g (2.25 oz.)
MethodEPA 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, Oxidised 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.