Relay NAND Gate Demonstration Board Biology_Entomology & Zoology Beech wood test tube rack

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

Square die-cast alloy boss head with metal thumbscrews

Used to generate triboelectric static charge by rubbing against glass

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

including 100 long flexible bonds for delocalized representations and crystal-lattice construction at scale

Relay NAND Gate Demonstration Board Biology_Entomology & Zoology Beech wood test tube rackRelay 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.