Balancing Lever Kit, Class Pack of 5 Lab Equipment and Supplies_Sensors NPN transistor in a protective

NPN transistor in a protective enclosure with labeled base

and image-formation experiments in introductory optics

preserving chemical resistance and thermal durability where the original is damaged or lost

Single-pole double-throw brass knife switch on a durable plastic base

Two-cylinder brass fluid-pressure apparatus with 19mm and 38mm leather-packed pistons connected by a brass tube

Balancing Lever Kit, Class Pack of 5 Lab Equipment and Supplies_Sensors NPN transistor in a protectiveFive lever balancing class pack with 600mm plywood levers, 4 fulcrum triangles, and 40 metal masses matched to 1%, deliberately using non standard graduations to build empirical reasoning.