An ultrasonic sensor for testing tubes of a heat exchanger having a U-shaped tube bundle includes a probe head unit having an ultrasonic vibrator and two opposite ends. Two flexible hollow shafts are each connected to a respective one of the ends of the probe head unit. One of the ho
A device for eddy current testing of tubes of a heat exchanger having a U-shape tube bundle includes a test sensor having an insertion tip and a longitudinal axis. Elastic hose pieces are connected to the insertion tip. At least three coils are disposed along the elastic hose pieces. A p
