A Sonde housing is a component of a drilling tool assembly that is designed to protect and secure the measurement-while-drilling (MWD) and logging-while-drilling (LWD) tools, often referred to collectively as sondes.
It is a thick-walled, tubular structure typically constructed from durable materials like steel or specialized alloys, designed to withstand harsh downhole conditions.
The housing is specifically designed to hold the MWD/LWD electronic devices, and may also have features for power sources and other tool components.