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Ultrasonic Leak Detector, AC Frequency Response 35 to 45 KHz Range, Centered At 40.5 KHz, Function Quickly Pinpointe The Origin Of Ultrasonic Sound Produced By A Variety Of Sources Such As Refrigerent Leaks, Electrical Arcing, And Worn Bearing, Includes Ultrasonic Detector, Probe Extention, Headphones, 2 InD In Size Batteries, Hard Plastic Carrying Case