Testing apparatus for diagnostic purposes (other than medical); Vibration detectors; Vibration sensors; Apparatus for sensing movement; Movement sensors; Rotary movement measuring apparatus; Rotary movement signalling apparatus; Measuring apparatus for measuring acceleration; Spectrum analysers, other than for medical use; Apparatus designed to monitor the performance of apparatus; Electronic apparatus for monitoring machines; Linear measuring instruments; Industrial controls incorporating software; Industrial computer software programs; Computer measuring devices containing data; Computer software for use in controlling machines