Triple Folding Magnifier with 25mm Lens, 10x Lab Supplies_Classroom Nylon ball-bearing adjustable clamp pulley

Nylon ball-bearing adjustable clamp pulley supporting low-friction rotation across varied rod-and-stand mounts

and a tapered spout

slotting inline with other modular demonstrator components

this center-zero galvanometer reads 35-0-35mV at 1mV per division on a fully enclosed EDM-80 housing

Wall-mounted Mason's hygrometer with two identical dual-scale thermometers — one dry and one kept wet via a water reservoir — calculating relative humidity from their paired reading difference

Triple Folding Magnifier with 25mm Lens, 10x Lab Supplies_Classroom Nylon ball-bearing adjustable clamp pulleyStacks three independently folding 25mm lenses for 10x magnification, each lens stowing into the housing for pocket portable classroom, field, and specimen work.