Rectangular Refraction Acrylic Block, 100 x 75 x 18mm Subcategory_Microscope Slides each 20mm on edge with

each 20mm on edge with a top hook for suspending in water during Archimedes-principle and buoyancy experiments

supplied with aluminum

this fan-shaped nylon brush rides a twisted stainless steel handle flexible enough to bend around difficult interior angles

Carefully lagged nickel-plated copper 3 by 2-inch inner cup inside a 4 by 2

this 80mm steel needle in a 6mm rod doubles as a precise alignment reference for image-formation and ray-tracing setups

Rectangular Refraction Acrylic Block, 100 x 75 x 18mm Subcategory_Microscope Slides each 20mm on edge withPairs 100 by 75mm with 18mm thickness on an acrylic rectangular refraction block, the wider working face giving longer beam paths for clear refraction angle measurements.