Electrostatic Friction Rod Kit, 3 Cloths and 3 Rods Type_Round End with retractable hooks for tandem

with retractable hooks for tandem stacking during physics force experiments

and brainstem for neurology

Wooden-framed abacus with two steel wires of 20 beads each on a 13

Electronic Stability Program Module - Item # AT-5202

this microphone amplifier connects a microphone input to both an integrated speaker and an oscilloscope-driving amplified signal for waveform study

Electrostatic Friction Rod Kit, 3 Cloths and 3 Rods Type_Round End with retractable hooks for tandemElectrostatic friction rod kit pairing wool, cotton, and silk cloths with glass, ebonite, and acrylic rods for triboelectric charge generation experiments in series.