Relay NAND Gate Demonstration Board Biology_Entomology & Zoology this universal charger keeps portable

this universal charger keeps portable instruments running between sessions without rotating in fresh disposable batteries

Used to generate triboelectric static charge by rubbing against glass

700-microfarad electrolytic capacitor in an ABS module with 4mm sockets

Square die-cast alloy boss head with metal thumbscrews

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 this universal charger keeps portableRelay 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.