Electrical, optical, acoustical, ultrasonic and/or laser scientific and laboratory instruments for counting, sizing, classifying, differentiating and identifying particles in solids, liquids or gases, for use in clinical, biological, industrial, medical, environmental, academic and/or scientific research and commercial laboratories; instruments for measuring rheological properties, namely, viscometers, rotary and capillary rheometers; instruments for measuring dimensional information of particles through image formation and analysis, namely, particle size, shape, structure and composition analysers; particle size and shape distribution and concentration measuring instruments, namely, particle counting instruments, air and liquid particle counters, photocorrelation spectroscopy instruments, instruments for producing zimm plots to determine the molecular weight of polymers, acoustic spectroscopy instruments, laser diffraction measuring instruments, all for use in clinical, biological, industrial, medical, academic and/or scientific research and commercial laboratories; particle charge measuring instruments, namely, zeta potential measuring instruments, electrophoretic mobility measuring instruments, particle mobility measuring instruments, pH measuring instruments, micro electrophoresis measuring instruments, all for use in clinical, biological, industrial, medical, academic and/or scientific research and commercial laboratories; 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 feeders, dispensers, auto titrators, nebulizers, ultrasonic baths, and temperature controllers; instrument controllers, namely, computers, digital signal processors and microprocessors, computer printers, computer software for controlling and operating all of the aforesaid goods; machine readable data carriers, namely, solid state memory devices, optical and/or magnetic storage media disks, magnetic tapes, all sold pre-programmed with control or analysis programs for use with the foregoing goods