Lens Holder for 50mm Diameter Lens or Mirror Item Type_Tongs the smaller-tube counterpart to the

the smaller-tube counterpart to the 300x44mm standard rheostats with the same constantan-winding construction

Spark in 20mm

supplied in a protective case so spare leaves stay flat and undamaged until installation

a 50mm double-convex glass lens spanning 300-1000mm focal lengths gives projection-style optics setups a single range-rated element

Six-piece polypropylene beaker set spans 50mL to 2000mL for complete classroom and lab volumetric workflows without glass breakage risk

Lens Holder for 50mm Diameter Lens or Mirror Item Type_Tongs the smaller-tube counterpart to theVersatile holder accepting either a 50mm diameter lens or mirror, the dual purpose mount giving optics setups one fewer accessory to track across reflection and refraction experiments.