This is the companion tester for the 120 VAC Breaker Blaster. This easy-to-use device can verify that a circuit is live by installing it into a 120 VAC light bulb receptacle. A loud audible tone sounds if the circuit is active. Next, go to the breaker box and throw the breakers until the tone stops. The Lamp Blaster has the same unique tonal pitch found in the 120 VAC Breaker Finder. The tone is designed to penetrate walls and can be heard at the box – even from a great distance. The circular design fits nicely into a tool belt. Electricians who love to use the economical Breaker Finder will want to add this to their collection.