instrument for detecting presence and direction of electric current
• (n.) An instrument or apparatus for detecting the presence of electrical currents, especially such as are of feeble intensity.
Gal·van`o·scope noun [ Galvanic + -scope : confer French galvanoscope .] (Electricity) An instrument or apparatus for detecting the presence of electrical currents, especially such as are of feeble intensity. 
Type: Term Pronunciation: gal′vă-nō-skōp Definitions: 1. An instrument for detecting the presence of a galvanic current.