4-Metal Equal Mass Cylinders Set (Copper, Iron, Aluminum, Zinc) Light & Optics_Spectroscopy 3g nickel-plated steel balls on

3g nickel-plated steel balls on a red wood base

Life-size human skeleton model features flexible spine

Hundred-milliamp tabletop analog DC ammeter at 2mA resolution

and engineering classroom activities

Cork-lined stainless steel safety flask tongs lock jaws around flask necks to prevent accidental drops during transfer of hot distillation vessels between bench stations

4-Metal Equal Mass Cylinders Set (Copper, Iron, Aluminum, Zinc) Light & Optics_Spectroscopy 3g nickel-plated steel balls onFour cylinder equal mass set at 100g each in copper, iron, aluminum, and zinc, with lengths varying by density to isolate the mass volume density relationship for student investigation.