The PCLM has been designed especially for application in modular electrical systems as used by military or quasi-military organisations for temporary bases, field hospitals, mobile communications centres, forward command centres etc.

The PCLM (Pilot Core Loop Monitor, also known as an earth resistance monitor ERM) measures the impedance of earth connections within Field Electrical Power Distribution Systems (FEPDS) and is designed for rough usage including air drop insertion (withstanding 1000G Shock) to operate in temperatures -40ºC to +80ºC and to withstand the bombardment of Neutron & Gamma rays in the event of a nuclear attack.