Blue Epoxy Wire Test Tube Rack, 80-Hole (8 x 10), for 22-25mm Tubes Lab Supplies_Sieves this metal wave helix demonstrates

this metal wave helix demonstrates pulse propagation

Air condenser in borosilicate glass measures 20cm with 19/26 ground joint for high-boiling-point reflux and organic chemistry procedures

Open-mount electromagnet bell on an 8x4-inch wooden base with a push button and 4mm banana sockets

Stand-mounted lift pump illustrating how atmospheric pressure lifts water through a valve-and-piston mechanism

Blue Epoxy Wire Test Tube Rack, 80-Hole (8 x 10), for 22-25mm Tubes Lab Supplies_Sieves this metal wave helix demonstratesEpoxy coated steel wire test tube rack with 80 holes in an 8 by 10 layout, sized for 22 to 25 mm tubes in high throughput biology and chemistry classrooms.