Microscopes; diffraction apparatus, namely, holographic microscopes for determination of properties of a colloidal dispersion; biological microscopes namely particle, droplet, bubble, cell, and microorganism sensors; electro-optical sensors; optical sensors; internet of things (IoT) sensors; photomicroscopes; monitoring instruments, namely light microscopes, holographic microscopes, particle size analysers, flow cytometers; downloadable or recorded environmental monitoring software for colloi...