Aluminum Tuning Fork with Round Stem, 512Hz (Note C) Capacity_50mL a battery-free source of partial

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

Miniature desktop torso with 12 removable parts includes a dissectable head and brain for compact classroom anatomy and biology teaching

sized for physics force experiments and balance calibration in classroom laboratory sessions

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

Aluminum Tuning Fork with Round Stem, 512Hz (Note C) Capacity_50mL a battery-free source of partialTuned 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.