Resonance Box with C-E-G-C Tuning Forks and Hammer Capacity_2000mL Continuously variable 100V-5kV output shown

Continuously variable 100V-5kV output shown on a 0-5kV digital voltmeter

5-inch compact and 6-inch long-format units

Student pulley demonstration set with a range of pulleys for mechanical-advantage and force-multiplication comparisons

3 glass beakers with DIN 12231 white graduations and a pouring spout

this plant cell model shows organelle ultrastructure and cell-wall layering for upper-level cell biology teaching

Resonance Box with C-E-G-C Tuning Forks and Hammer Capacity_2000mL Continuously variable 100V-5kV output shownSolid wooden resonance box mounts four steel forks tuned to C 256Hz, E 320Hz, G 384Hz, and C' 512Hz a major chord array struck with the included hammer to amplify intervals and harmony.