Triple Folding Magnifier with 25mm Lens, 10x Lab Supplies_Classroom this center-zero galvanometer reads 35-0-35mV

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

the candy-bar form letting students break each piece into smaller magnets that retain their own north and south poles

and 3 rods for multi-configuration study

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

interference

Triple Folding Magnifier with 25mm Lens, 10x Lab Supplies_Classroom this center-zero galvanometer reads 35-0-35mVStacks three independently folding 25mm lenses for 10x magnification, each lens stowing into the housing for pocket portable classroom, field, and specimen work.