It is an copy of a sandstone pendulum found in Egypt's Valley of Kings, Karnak is now cast in brass, or carved in ebony. It is 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, but caution should be exercised in its use and it should be stored dismantled.