Single-Pole Double-Throw Knife Switch Category_Science Kits Fifty-turn 4A coil for the

Fifty-turn 4A coil for the demountable transformer

Optically-worked glass double convex lens with a 150mm focal length and 1

Wear-replacement timer switch for the goggle sanitizer cabinet

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

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

Single-Pole Double-Throw Knife Switch Category_Science Kits Fifty-turn 4A coil for theSingle 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.