Semicircular Glass Block, 90 x 18mm Racks & Stands_Flask Stands with 4mm sockets at each

with 4mm sockets at each end for resistivity comparison

with both 4mm stackable sockets and screw terminals so leads wire in without an adapter to either bench standard

lightweight and shatter-resistant for image-formation and ray-tracing experiments

Research-grade oxygen spectrum tube at 26cm with a 10cm central capillary

allowing this tangent galvanometer to convert deflection angle into an absolute current reading

Semicircular Glass Block, 90 x 18mm Racks & Stands_Flask Stands with 4mm sockets at eachGlass semicircular block at 90 by 18mm, the slim half disc geometry letting beams enter the curved face along its radius for clean refraction angle and TIR observations.