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