Scientific, surveying, optical, weighing, measuring, signalling, checking (supervision), and teaching apparatus and instruments; laboratory apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; data processing equipment, computers, printers and microprocessors; measuring, monitoring, calculating, and analysing apparatus and instruments; particle sizing apparatus and instruments; instruments for measuring particle concentration, environmental temperature and humidity monitoring instruments, PH measuring instruments; laser diffraction measuring instruments, all for use in clinical, biological, industrial, medical, academic and/or scientific research and commercial laboratories, and for integration into industrial processes; apparatus for preparing samples, suspensions, sprays, and emulsions of particles for use with any of the aforesaid goods, namely, sample dispersion units, stirred cells, autosamplers, dry powder dispersers and conveyers, dispensers, autotitrators, nebulizers, ultrasonic baths and probes, and temperature controllers; image analysis apparatus and instruments; electrical, optical, and/or laser scientific and laboratory instruments; laser-containing measuring or characterising apparatus and instruments; diffraction measuring apparatus and instruments; particle size distribution measuring apparatus and instruments; apparatus for preparing samples, suspensions, sprays, emulsions of particles for use with any of the aforesaid goods; apparatus and instruments for controlling particle sizes, apparatus for controlling combustion, control systems for copier quality, control systems for powder quality, process control systems, including control systems for continuous processes, monitoring devices for airborne or pneumatically carried particles; parts and fittings for the aforesaid goods