Educational apparatus and models, designed for demonstrational and exhibition purposes, unsuitable for other uses, and structural parts thereof, namely, sound kits comprised of resonators used in the demonstration of standing waves to observe the resonance phenomena as well as the speed of sound in air by exploiting standing waves, resonance effects in longitudinal waves and also the resonance points for a certain frequency and their relation with the standing wavelength, electricity kits such as electric dough kits comprised of electrical circuits, LEDs and electric buzzers, earth science kits comprised of turbidity measurement apparatus, chemistry kits comprised of laboratory equipment and supplies, namely test tubes, force and motion kits comprised of stroboscopes within ripple and wave tanks, kits for demonstrating properties of matter comprised of laboratory equipment and supplies, namely test tubes; Ammeters; Calibrated glassware; Galvanometers; Graduated glassware; Glassware for scientific experiments in laboratories; Laboratory equipment and supplies, namely, test tubes; Laboratory equipment, namely, crucibles; Microscope condensers; Prepared microscope slides; Prisms for scientific purposes; Protective clothing especially made for use in laboratories