STM-9 STETHOSCOPE (CONTACT) MODULE:

This module has a metal rod that acts as a “waveguide”. It is sensitive to ultrasound that is generated internally such as within a pipe, bearing housing or steam trap. Once stimulated by ultrasound, it transfers the signal to a piezoelectric transducer located directly in the module housing. It is “module shielded” to provide protection from stray RF waves that have a tendency to effect electronic receiving and measurement. It is equipped with low noise amplification to allow for a clear, intelligible signal.