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This Air Ion Tester is designed for test high level concentration of negative or positive air ion. The blue clip is a ground connector to make the test reading stable. One end of clip hang on the hand, the other end clamped ground line or water tap. It is effective to test the electric charge on the surface of textile by strict. With it you can estimate whether the sir ion generator or air purifier is working in good state. The reading of this tester is correlative to the air ion concentration, but not exactly the number of it. In factor, this tester can only provide you a rough measurement to the air ion source. Please don't take it as an precision instrument.
Measure negative air ion in high concentration condition with maximum hold