The principle of ultrasonic fault-finding has been known for many years and is not questioned. But there have been till now problems with its application, with devices with inadequately sensitive and selective microphones and unable to electronically filter out the disturbances which are always present in a working factory. The Ultrasonic SPY 101 normally exceeds the clarity required to make a rapid, unequivocal diagnosis. We can with justification talk of a technical break-through.

The SPY is only 23.4 cm long and weighs 320 grams. To adjust for the required sensitivity, only one switch and one knob are required. It is hardly possible to think of simpler operation. According to the application, there is a selection of probes to be added, which receive signals out of the air or by direct contact.

Is time money ? Users report that, by introducing the SPY, they have reduced their search and diagnosis times by 80% to 90%.