Right-angle glass prism. Optical quality, usually about 3/4" to 1" long and 1/2" to 5/8" wide on hypoteneus (variable supply). These prisms have been recycled from a variety of optical instruments and have superior optical quality in comparison with prisms that are mass-produced for the educational market. Sunlight beamed through them will produce a more defined and separated spectral image.
Forensics Lab Supply Number 5406159.
HS Code 701710.