As Graseby Instruments it made and refurbished naval sonar equipment.
Graseby Dynamics' business activities were: - Marine - the ex-Instruments services, - Medical - principally Cot Death Monitors and Continuous Syringe Drivers, - Ordnance - including test and post-design services, - RF products - specialist services and the manufacture of Personal Locator Beacons (PLBs), - Ionics/Security/Analytical providing vapour detectors based up Ion Mobility Spectrometry - the three identities addressing the Military, Civil and Space markets respectively.
Later Graseby Dynamics became part of Cambridge Electronic Industries plc.
As part of a rationalisation process Cambridge Electronic Industries later changed it name to Graseby plc in January 1992 - a process it extended to many of its remaining subsidiaries, e.g. Newmarket Semiconductors became Graseby Semiconductors In April 1988 Graseby Ionics won the Queen's Award for Technological Achievement for CAM, a hand-held chemical agent monitor.
Graseby Product Monitoring included Goring Kerr,[3] Best and Allen Coding was absorbed by Thermo Sentron for US$43m.