Relay NAND Gate Demonstration Board Biology_Entomology & Zoology Polystyrene electrolyzer with a transparent

Polystyrene electrolyzer with a transparent cone-shaped cup over a banana-socket base

Square die-cast alloy boss head with metal thumbscrews

Millimeter-graphed 100 x 75mm screen on a 2

Used to generate triboelectric static charge by rubbing against glass

Beech wood test tube rack holds 12 tubes up to 20mm diameter in a 9-inch frame for organized storage during chemistry and biology experiments

Relay NAND Gate Demonstration Board Biology_Entomology & Zoology Polystyrene electrolyzer with a transparentRelay based NAND gate module on a demonstration base, introducing combinational logic behavior by using physical relays so students can hear and see the gate state in real time.