Light-Dependent Resistor Demonstration Board prop65 Two-speed ticker timer kit printing

Two-speed ticker timer kit printing 25 or 40 dots per second on paper tape via carbon discs

25-inch base

Sixty-five-piece molecular model set with 32 atoms and 33 bonds for demonstrating bonding angles

100 by 100mm friction slider

letting students rub one half against the same cloth and compare insulator and conductor behavior in triboelectric charging

Light-Dependent Resistor Demonstration Board prop65 Two-speed ticker timer kit printingMounted light dependent resistor with terminal connections, dropping resistance dramatically as light strikes the cell and giving students a visible introduction to photoelectric sensing.