Aluminum Tuning Fork with Round Stem, 512Hz (Note C) Capacity_50mL 5x clear views through a

5x clear views through a 3-inch optical-glass lens with a 6-inch focal length

registering induced or conducted charge through the Coulomb-driven deflection of a single suspended leaf

a battery-free source of partial vacuum for bell-jar demonstrations without external power

Fine-gauge 24 SWG bare copper wire on a 250g reel approximating 375 feet

hybrid electronic control unit

Aluminum Tuning Fork with Round Stem, 512Hz (Note C) Capacity_50mL 5x clear views through aTuned to 512Hz (note C), the standard frequency for hearing test calibration, this 6. 25 inch aluminum tuning fork features a round stem that grips firmly without damping the vibration.