It is based on a sandstone pendulum found in Egypt's Valley of Kings, Karnak is now made out of brass, or carved in ebony. It is very sensitive and has very broad range of uses: from water and mineral witching through checking food, diagnosing, checking and dozing medicines and therapeutic radiesthesia and detecting harmful radiation.
Karnak is a mental pendulum and can be used as a transmitter and as a receiver. It radiates its own energy, so it doesn't need neutralization. It sends a ray of negative green to the North, so don't dowse for a long periods with your back to the North.
2 3/4" (70mm) 1.62oz