Hexatronic MPB32100/1 is an Optobit marker ball tuned to the 101.4 kHz frequency used to identify buried telecommunication assets. Placed at cable joints, duct bends, manholes and other underground infrastructure, it allows crews to relocate the point later using a compatible EMS marker locator without excavation. The orange colour follows the telecom colour code, and the sealed housing resists soil moisture over long service life. Supplied in packs of 33; typical application is fibre-optic and copper telecom network documentation.