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You cannot tell if your negative ion generator is working properly without an indicator light or a detector because you cannot see ions with the naked eye.
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Test operation
 
 
Test operation - (Extract from "Pay attention to specifications")
 
 
  
  
    
      
        
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Specification item
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Example
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Importance
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Test operation
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Comes with the ion detector for test operation
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Middle
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You cannot tell if your negative ion generator is working properly because you cannot see ions with the naked eye.
 
 
A negative ion generator which has a built-in indicator light and/or comes with a detector is ideal 
because they assure you that it is generating negative ions.
 
 
 
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