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

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

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

Millimeter-graphed 100 x 75mm screen on a 2

Square die-cast alloy boss head with metal thumbscrews

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.