4-Cell D-Size Battery Holder Capacity_10mL Needle valve and flame stabilizer

Needle valve and flame stabilizer add precision control to this nickel-plated micro Bunsen burner running on natural gas for small-flame work

Chrome-plated steel wire stand at 5 x 5 x 5 inches supports flasks and beakers above alcohol burners for classroom chemistry demonstrations

letting students measure rotational distance against linear advance to derive the mechanical advantage of the spiral

resistor networks

Shows oxygenated and deoxygenated blood paths between heart chambers and alveolar surfaces through seven hand-painted removable parts designed with medical-professional input

4-Cell D-Size Battery Holder Capacity_10mL Needle valve and flame stabilizerFour cell D size holder in unbreakable plastic with curved retention sides, sized to deliver 6V at the high current capacity of D cells for sustained electromagnet and motor demonstrations.