Electrical, optical, rheological, image analytical, acoustical, ultrasonic and/or laser scientific and laboratory instruments for particle identifying, sizing, counting, classifying, differentiating, and grading, for measuring particle speeds, mobility, and distribution, and for monitoring airborne or pneumatically carried particles in liquid or gases; particle analyzers for grading and measuring concentrations of accumulations of particles; absorption scattering instruments employing UV-vis-IR optical absorption, ultrasonic absorption, and turbidity monitoring, for measuring real time of particle properties, transmitters and receivers, ejectors, dryers, and separators; monitoring and control instruments for grading, namely, laser diffraction size grading; particle mobility measuring instruments, environmental monitoring instruments, ph measuring instruments; instruments to determine the molecular weight of polymers, namely, air and liquid particle counters, photon correlation spectroscopy instruments, micro electrophoresis measuring instruments, acoustic spectroscopy instruments, laser diffraction measuring instruments, all for use in clinical, biological, industrial, medical, academic and/or scientific research and commercial laboratories; diffraction measuring apparatus and instruments, namely, particle size, shape, and composition distribution analysers; sedimentation, sieve, diffraction, and zeta potential laboratory instruments; apparatus for preparing samples, suspensions, sprays, emulsions of particles for use with any of the aforesaid goods, namely, sample dispersion units, stirred cells, autosamplers, dry powder feeders, autotitrators, nebulizers, ultrasonic baths, temperature controllers, sample grabbers, extractors, fluidisers, dispensers, diluters, concentrators, separators, dispersion units, measurement cells, auto-sampling units, automated preparation stages; control systems, namely, electrical controllers, computer hardware and computer software for controlling all of the aforesaid goods and for controlling copier and powder quality: replacement parts for the aforesaid goods.