Wratten filter is a combination of two filters cut to size and calibrated; reusable, disposable; to detect particles in fuel samples
NSN 4140-01-025-8487
NSN 5975-01-578-6829
NSN 5925-01-068-2887
NSN 5905-00-501-7381
NSN 5930-00-268-0323
NSN 6610-01-194-5384
NSN 5905-01-429-9943
NSN 6610-01-468-0679
NSN 5930-00-006-9138
NSN 5910-00-918-2979
NSN 6645-01-150-2039
NSN 5985-00-633-9963