galvanoscope
noun
                                                                                                                            
                                                            gal·va·no·scope
                    
                                                                                                              
                                                                                                                                  gal-ˈva-nə-ˌskōp 
                                                                                                                                  ˈgal-və-nə- 
                                                      
                                                          
            
                                
              
          
                                                      : an instrument for detecting the presence and direction of an electric current by the deflection of a magnetic needle                                      
                
                    
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  Merriam-Webster unabridged




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