K9 Optical Glass Triangular Prism 40x40x180mm | Physics Teaching Tool for Illumination Spectrum & Rainbow | Science Experiment / Photography / Youth Education | High - Grade
Mini Survey Prism with Bracket | + 17.5mm Constant K9 Optical Glass Lens | Tiltable Prism for Total Station/Tunnel/Mine Surveying | Yellow ABS Housing, 1 Inch Diameter
