Free Chlorine Colorimeter HI701 Hanna Checker - Fresh Water

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Free Chlorine Colorimeter HI701 Hanna Checker - Fresh Water

100% Recommend this to a friend (1 of 1)

SKU: 208174

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Quick Overview

Four simple steps to results. Easily and accurately test for free chlorine with the Hanna Checker Colorimeter (HI 701). Designed to be more accurate alternative to chemical test kits. First, add sample to the included cuvette. Next, insert sample into the Checker and zero the instrument with your water sample. Then, remove sample and add the reagent. Finally, place the vial into back into the Hanna Checker, press the button and read the results. Done.

Use in conjunction with the Hanna Checker Total Chlorine Colorimeter to help determine chloramines in your water.

Full Details

Hanna Checker Free Chlorine Colorimeter Manual

Easier to use and more accurate than chemical test kits.The HI 701 from Hanna Instruments uses EPA approved DPD method. Auto shut off after 10 minutes of non-use.

Dedicated to a single parameter

Two sample cuvettes and caps. Six packets of Free Chlorine powder reagents.

Small Size, Big Convenience

Weighing just 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. Single button operation: Zero and Measure Operated by a single AAA battery.


  • Range:0.00 to 2.50 ppm (mg/L)
  • Resolution: 0.01 ppm (mg/L)
  • Measurement Method: Colormetric
  • Accuracy: ±0.03 ppm (mg/L) ±3% of reading
  • Environment: 32 to 122° F(0 to 50°C); RH max 95% non-condensing
  • Light Source:LED @252 nm
  • Light Detector: Silicon photocell


1 Item

  • Simple to use; fast results By Steve on 11/25/2014

    I was using the DPD Total chlorine reagent colorimetric test in an attempt to accurately determine when my RO/DI pre-filter carbon blocks had been exhausted of their capacity to remove chlorine from the city water supply. Even after replacing my carbon block with three brand new carbon blocks used in series, the DPD total chlorine reagent produced a slight pink color. The color intensity appeared to be less than the limit of quantification for the test (<0.02 ppm), but it left me wondering if my results were not biased by my desire to see a low reading. The Free Chlorine HI701 Hanna Checker HC was simple to use. I found that my carbon blocks after three months of use (several thousand gallon of water passed through them), produced a result of 0 ppm – free chlorine. My only regret is that that this kit does not measure chloramine. If I could go back and do it again, I would have purchased the Total Chlorine Ultra Low Range HI761 checker (0-500 ppb total chlorine).


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Product Questions

can replacement additives for this hanna check be bought to continued testing once the ones that come with the unit are used up ??? bill
Question by: bill on Feb 14, 2015 5:44:00 AM
Great Question Bill! We certainly do sell reagents for this checker found here:
Answer by: Bulk Reef Supply on Feb 14, 2015 5:44:00 AM