CB-7630        
                                                                                《Product Introduce 》:
                TwIN LEAD CIRCULT TESTER 
 Economy twin leas tester, for chekg circuits 80 to 500 volts, Ac or Dc.  ldeal for testing outlets, switches, fuses, spark plugs and other  electrical devices, can also be used to check DC polarity frequency and  polyphase curcuits.