The Sovereign is one of the best nickle detectors,but a 180 meter must be used.Example a modern nickle at 147,most Jeffersons 144-145,Buffalos143,V nickles 142,Shields 142-141 and War nickles 150-151.All these nickle signals on the Sovereign will have a solid tone.There is a little more thrash in the nickle zone.Good Luck Ron