11-Piece Rectangular Retort Stand Set with Bossheads, Clamps, and Rings Biology_Microscopy suspending thermometers above hot plates

suspending thermometers above hot plates or fixing specimens in orientation

Large-format Boyle's Law apparatus with hand pump

Pan balance demonstration lever with a low-friction brass pivot

5-inch height

where current through a coil closes a separate contact and shows how a small signal controls a larger circuit

11-Piece Rectangular Retort Stand Set with Bossheads, Clamps, and Rings Biology_Microscopy suspending thermometers above hot platesEleven piece retort stand starter set combining a heavy duty rectangular base and rod with three support rings, three boss heads, and four vinyl coated clamps for complete apparatus assembly.