Performance Tool W2981 Heavy Duty Circuit Tester (6/12/24 Volt) With 3-1/2" Probe Heavy duty test lead with spring clip Tests 6, 12 and 24 volt AC and DC circuits Reinforcing spring prevents damage to test lead at base of handle Lifetime Warranty Tests 6, 12 and 24 volt AC and DC circuits Reinforcing spring prevents damage to test lead at base of handle