text: In 1982 the British PDRM82 was issued for civil defence. This model is lightweight, with an LCD display and a plastic case, and has all the electronics, including miniature Geiger tube (shielded against beta particles), on a single, EMP-hardened, PCB. It was designed by Plessey to use three standard 1.5 volt cells, and is microprocessor controlled with digital readout.
  For use by the Royal Observer Corps, the instrument was also provided in the fixed version designated the PDRM82(F). The fixed version had an external coaxial socket mounted on its rear that accepted a cable from the above ground ionisation detector under a polycarbonate dome. For training purposes, timed simulated readings could be fed to the meter from an EPROM.