6-Hole Premium Wooden Test Tube Rack with Pins, 9.4", for 25mm Tubes Category_Lab Equipment sized to drop different loads

sized to drop different loads into a circuit without rewiring

and 38mm lens holder - an inexpensive starter platform for image-formation experiments

Spanning C (256 Hz) through C (512 Hz) in scientific pitch

relating photon frequency to the kinetic energy of emitted electrons for quantum physics investigations

Metal spouting cylinder with multiple outlet holes at different heights

6-Hole Premium Wooden Test Tube Rack with Pins, 9.4", for 25mm Tubes Category_Lab Equipment sized to drop different loadsHand crafted hardwood test tube rack with six 25 mm holes and six drying pins on a single tier, sized at 9. 4 inches long for chemistry and microbiology classroom stations.