GA-72Cd Metered Magnetic Locator with Case The GA-72Cd Locator detects the magnetic field of iron and steel objects. It provides audio detection signals that peak in frequency when the locator's tip is held directly over the target. The GA-72Cd has the option of nulling or peaking. Unit ships with: Carrying Case (p/n: 302145) 2 – 9V Alkaline Batteries (in unit) (p/n: B11013)