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This new design of mini air ion tester keep the peak value (maximum reading) of negative air ion on the dispay. So, it provide the reading more stable and more easy to read.
IntroductionThis Air Ion Tester is designed for test high level concentration of negative or positive air ion of air ion generator. With it you can estimate whether the air ion generator or air purifier is working in good state. The reading of the 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 position & negative air ion in high concentration condition