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A quality Mini Air Ion Tester is designed for testing high level concentration of negative or positive air ion of air ion generator/ionizer, Nefful Negative Ion clothing, power balance wrist bands or other strong negative ion sources such as waterfall. Air Ion Tester is designed for testing high level concentration of negative or positive air ion of air ion generator/ionizer, Nefful Negative Ion clothing, power balance wrist bands or other strong negative ion sources such as waterfall.