link? because as afar as i know it is ONLY possible to meassure chlorine in water in a chemical way (drop test liquid). Most cheap "chlorine test advertisements" only meassure parts per million in the water which excludes chlorine! ... Thats the issue. Still like to check out the product you say.
https://www.amazon.com/Chlorine-Swimming-Quality-Analyzer-Testing/dp/B07V7XTZWJ/ref=mp_s_a_1_5?crid=5CAOIFDAZP12&keywords=digital+pool+water+tester+ph+and+chlorine&qid=1678055534&sprefix=pool+tester+digital+chl%2Caps%2C679&sr=8-5
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i have that one already, and it works the way i described and isnt accurate.... it meassures parts per million.