Rectangular Refraction Acrylic Block, 100 x 75 x 18mm Subcategory_Microscope Slides this metal-cased spectroscope pairs a

this metal-cased spectroscope pairs a 600 lines/mm holographic replica grating with sample vials and mount

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

87-inch focal length

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

Rectangular Refraction Acrylic Block, 100 x 75 x 18mm Subcategory_Microscope Slides this metal-cased spectroscope pairs aPairs 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.