Ultrasonic testing devices have long been established in the field of predictive maintenance to detect leaks on compressed air systems. These devices usually record a frequency range around 40 kHz. SONOTEC GmbH is breaking new ground with the SONAPHONE ultrasonic testing device. The main difference between this device and the previously available devices is the broadband technology of the sensors in a frequency range from 20 to 100 kHz. This makes applications like automatic leak analysis more reliable.