Coupling: Coupling with the 3-pin base and steel pillar for the test rack.
Springs: Made of steel wire, nickel plated, with good elasticity, length 300 mm.
Elastic cord: Wire thin, 1000 mm long.
Manometer: Type 5N, minimum scale 0.1N.
Pulley: 20mm diameter minimum.
Vibrator Electrodynamic type, using power from a frequency generator.
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