Early 1970's; Mike Brain SWT seated at the workbench in the MU Calibration Laboratory operating the JRL equipment. The standard cell oven, null detector, resistance bridge, primary voltage potentiometer and voltage divider was used as the standard when calibrating test equipment used in the Weyhill workshops to check and calibrate the Directorate's fleet of test meters of the day, such as the ubiquitous Avo 8.
