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
i have that one already, and it works the way i described and isnt accurate.... it meassures parts per million.
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