Double Concave Glass Lens, 50mm Diameter, 150mm Focal Length Stock Type_Stocked sized for whole-class visibility during

sized for whole-class visibility during gas-law and fluid-mechanics lessons

25-inch aluminum tuning fork features a round stem that grips firmly without damping the vibration

Reel of 30 SWG bare copper wire totaling about 1150 feet by mass

this compact insulated wire keeps color-coded wiring intact when student work shifts to small-scale breadboarded circuits

Double Concave Glass Lens, 50mm Diameter, 150mm Focal Length Stock Type_Stocked sized for whole-class visibility duringPairs 50mm of aperture with a 150mm focal length on a double concave glass lens at ~5. 5mm thick, the diverging curvature spreading light gently for virtual image formation.