Vappro NDT F.D. (Non-Destructive Test Kit) Surface Flaw Detection System NATO STOCK NUMBER 6850-32-077-3780, MIL-I-25135, MIL STD 271 and NAVShips 250-1500 Kit includes one each of the cleaner, penetrant and the developer to easily view surface flaws as bright red on a white background. Three aerosol cans with instructions and product data