Bourdon Gauge, 0-2.5 kg/cm² / 0-35 PSI Item Type_Springs demonstrating how a crane lifts

demonstrating how a crane lifts loads through the mechanical advantage of a large wheel turning a small axle

sized to extend RC time-constants where charging and discharging curves stay watchable in real time

Pocket-sized 45mm aluminum compass with a graduated dial

Permanent-magnet stack inside an 8 x 5 inch base recharges weakened bar and horseshoe magnets by realigning their domains - no electrical power

Relay-based NAND-gate module on a demonstration base

Bourdon Gauge, 0-2.5 kg/cm² / 0-35 PSI Item Type_Springs demonstrating how a crane liftsClear case Bourdon gauge with a 3. 88 inch face reading 0 2. 5 kg cm and 0 35 psi, visible inner mechanism letting students watch how the Bourdon tube curves under changing pressure.