Spare 3" O-Ring Belt for Van de Graaff Generator Human Anatomy_Human Anatomy Models and molecular structure for genetics

and molecular structure for genetics and biochemistry instruction

Drops the focal length to 10cm on a 60mm aperture in alternate-model framing

ready for acid-base titration endpoints and universal indicator preparation in chemistry labs

One-microfarad electrolytic capacitor in an ABS module with 4mm sockets

Wide-field 100mm reading magnifier with a 15cm focal length

Spare 3" O-Ring Belt for Van de Graaff Generator Human Anatomy_Human Anatomy Models and molecular structure for geneticsSpare 3 inch O ring drive belt sized to the smaller Van de Graaff pulleys, kept on hand to keep electrostatic generators running once the originals stretch out of tolerance.