Concave Glass Mirror, 75mm Diameter, 75mm Focal Length Handle Type_Twisted Wire and a dual-scale screen

and a dual-scale screen

this pack of premium qualitative filter paper offers medium-speed gravity filtration with a 10-micron pore size at 85 gsm weight

Mounted Zener diode on a transparent base with 4mm color-coded sockets and a printed circuit diagram

stable triggering to 30 MHz

producing distinct audible pitches at varying spin speeds to relate rotational frequency to perceived sound frequency

Concave Glass Mirror, 75mm Diameter, 75mm Focal Length Handle Type_Twisted Wire and a dual-scale screenConcave glass mirror at 75mm aperture and 75mm focal length, ~3mm thick, the f 1 geometry producing strongly converging beams for vivid magnification and real image demos.