bids are invited for spare for dps laboratory motorized precision rotation stage m with dc servo motor driver and power supply , o25.0 mm mounted wire grid polarizer 420-700 nm , o1per2 inch mounted achromatic quarter-wave plate o1 inch mount 400 - 800 nm , o1 inch mounted achromatic half-wave plate sm1-threaded mount 400 - 800 nm , o1 inch zero-order half-wave plate sm1- threaded mount 633 nm , dovetail optical rail 450 mm metric , dovetail optical rail 300 mm metric , dovetail optical rail 600 mm metric , complete periscope assembly metric mirrors not included , hard-coated bandpass filter o25 mm cwl - 530 nm fwhm - 10 nm , hard-coated bandpass filter o25 mm cwl - 532 nm fwhm - 4 nm , hard-coated bandpass filter o25 mm cwl - 633 nm fwhm - 5 nm , visible transmission grating 300 grooves per mm 17.5 deg groove angle 25 mm x 25 mm , rotation mount for o1 inch 25.4 mm optics m4 tap , high-precision rotation mount for o1 inch 25.4 mm optics total quantity : 23