How to Calibrate the HI-701 Free Chlorine Checker

Published: 24 March 2025
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This step-by-step tutorial provides all the information you need to calibrate the HI-701 Free Chlorine Checker from Hanna Instruments UK with Cal Check Standards, available online at Hanna Instruments with next-day delivery on all in-stock solutions.

These steps include:

  1. Preparing for the calibration process
  2. Inserting the Zero cuvette
  3. Inserting the Standard cuvettes
  4. Completing calibration

What are Checkers?

Hanna Checkers are easy-to-use, incredibly accurate testers that help you get your aquarium parameters on track. Throw out the test strips and go digital with a simple, palm-sized tester that does all the work for you. Simply take a sample, add the reagent included in your starter kit, and get your reading. 

The Checker range covers all key parameters for freshwater and saltwater testing, from common requirements like nitrate and ammonia to niche testing for phosphate, iron and chlorine. Checkers are suitable for a wide range of industries and applications, from aquariums to agriculture, swimming pools to water monitoring. Browse the Checker range here.

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