Ultrasonic Diagnostic Tool, Detects Leaks in Refrigerant, Compressed Air,Natural Gas,Propane, Gear and Bearing Wear, Electrical Discharge, Seal and GasketIntegrity, etc., Includes Ultrasonic Receiver, Ultrasonic Emitter, Hollow Air Probe, Contact Probe, HP 100 Noise Canceling Headphones, and Rugged Carrying Case