Spectrum Tube Holder Light & Optics_Color and core layers detach one

and core layers detach one by one for geology instruction

tightened with an Allen wrench for constructing lattice frameworks on laboratory benches

and a semi-circular glass block fill this tabletop optics kit

sized to drop a low-resistance load into a student-built circuit without rewiring or component-mounting

equipped with heavy sliders whose fine index marks give repeatable readouts for image-formation and focal-length measurements

Spectrum Tube Holder Light & Optics_Color and core layers detach oneBosshead equipped spectrum tube holder with 4mm safety sockets on a black panel, mounting any 26cm tube to a laboratory stand for spectroscopy demonstrations from any orientation.