50 yards on a single coin. Up to one mile on larger targets.
in the USA
The Thunder Stick is a totally "new innovative approach" to long range locating. The transmitter derives its power from natural earth energy. Simply place the Thunder Stick into the ground and it starts transmitting immediately. Full power is obtained within 15 minutes. A signal is sent out 360 degrees, which is then picked up by the operator using a "single tuned receiver rod" (supplied). Discrimination is for "all gold" and "all silver" via samples, which are easily interchanged.