Nobotech Water dissolved free chlorine /ozone pen tester

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Water dissolved free chlorine /ozone pen tester, compact design, one unit integration for easy operation and fast reading.
Water residual chlorine meter or dissolved ozone meter of handheld for water testing
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Pentype water free chlorine tester and dissolved ozone tester, easy to carry around and easy to test.
Aslo you may check the video how to use it.
Nobowisd self patented products, 2 in1 design for simple operation

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