3" ABS Pulley with 50mm Ball Bearing and Thumbscrew prop65 illustrating the primary-battery chemistry behind

illustrating the primary-battery chemistry behind the Leclanche cell — the historical predecessor of the modern dry battery

Two-ohm metal-film resistance unit at plus-or-minus 1% accuracy with a 1

and one 1 kg mass with a 0

supplying a finer-gauge option for precision resistors and standard-cell construction in physics labs

Designed to grip a wide variety of optical components on standard bench rails

3" ABS Pulley with 50mm Ball Bearing and Thumbscrew prop65 illustrating the primary-battery chemistry behindABS plastic pulley with a 50mm ball bearing wheel, a thumbscrew clamp for rod attachment, and an 18mm attachment diameter for pulling small weights in mechanical advantage experiments.