Single-Pole Double-Throw Knife Switch Category_Science Kits a distinctive density reference against

a distinctive density reference against the lighter aluminum and heavier steel cylinders

Pink dots mark opposing poles on this 37 x 9mm Alnico cylinder pair

Sodium chloride lattice kit with 27 color-coded gray and green atoms plus 54 connectors for building the full cubic NaCl crystal structure in three dimensions

5% accuracy with an inclined face

which comprises a 19 color LCD monitor

Single-Pole Double-Throw Knife Switch Category_Science Kits a distinctive density reference againstSingle pole double throw brass knife switch on a durable plastic base, used to route current down one of two alternative branches in series parallel circuit investigations.